What is Trigonometery: Definition and 83 Discussions
Trigonometry (from Greek trigōnon, "triangle" and metron, "measure") is a branch of mathematics that studies relationships between side lengths and angles of triangles. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies. The Greeks focused on the calculation of chords, while mathematicians in India created the earliest-known tables of values for trigonometric ratios (also called trigonometric functions) such as sine.Throughout history, trigonometry has been applied in areas such as geodesy, surveying, celestial mechanics, and navigation.Trigonometry is known for its many identities. These
trigonometric identities are commonly used for rewriting trigonometrical expressions with the aim to simplify an expression, to find a more useful form of an expression, or to solve an equation.
Problem statement : I copy and paste the problem as it appears in the text. I hope am understanding its wording correctly.
Diagram : The river is shown in blue. The two roads start from the crossing C and end in A and B, making angles ##60^{\circ}## and ##30^{\circ}## resectively. The longer...
so basically, here is a photo from the textbook(in attachments) and I'll write here how I did it. In my opinion, results should have been the same, but for some reason, they differ. So, if anyone can tell me what I am doing wrong I would appreciate it since I can't find mistakes caused by wrong...
Problem Statement : The statement appeared on a website where a different problem was being solved. I got stuck at the (first) statement in the solution that I posted above 👆. Here I copy and paste that statement from the website, which I cannot show :
Attempt : To save time typing, I write...
I have a table of values (from my own analysis, not from a textbook) that represents a portion of a periodic function:
x
y
0
30
1
20
2
10
3
10
4
20
5
30
What function satisfies the table? What I know is that the function is periodic. I was thinking I could use cosine because its...
I have been doing the resolutions of vectors on x and y-axis with making triangles and reference angles in all quadrants. But I want to calculate now how to find something like ##\sin 235## without the help of reference angles. I know we don’t need to. Calculator and Taylor theorem is handy here...
I am planning to build my own laptop stand with an acrylic sheet. The final product should look like the one in the attached image (bottom right)
Material: most laptop stands are made with 6mm acrylic thickness, hence this is what I will use. Also I already have this material at home.
I am...
Summary:: AmbientNoise + AntiNoise combined calculation
I am having trouble with this question:
Noise cancelling headphones use both passive (insulated earphones) and active (electronic “anti-noise”) methods to nullify ambient noise. One task of a sound engineer is to design low-energy...
In a process of writing a game. Effectively need to know how to angle the barrel for the projectile to hit the selected target.
So for the equation
y = h + x * tan(α) - g * x² / 2 * V₀² * cos²(α)
Everything except α is known. Could anyone more wise in the ways of science than me help me solve...
Hello!
I'm trying to solve this problem.
Here's the diagram I tried to make.
I have difficulty understanding this math problem.. I've tried to solve the problem using the symmetry of the triangles but I didn't get the right answer, and I can't seem to understand the "concept" of the horizon...
Lets say that a man with a standing height of 185cm bent his knee 30 degrees, how many centimeters will be reduced from his standing height? Assume his femur length is 60cm and his tibia (shin) length is 50cm.
Can anyone give me a hint?
I've tried to use trigonometry but i don't think i fully...
I've tried to attempt the first part of the problem(spent over an hour on this) as second part could be easily optained with some calculus ,I asked my friend but alas nobody could conjure the solution to this dangerous trigonometric spell.
It was just pages and pages of concoction of...
My reasoning and answer is wrong, but I cannot figure out why.
Perhaps it is strange, perhaps not, but I want to figure out why my initial method of solving this problem did yield an incorrect answer.
I began by creating an equation and drawing a right triangle.
x is the horizontal part of...
Hi all,
I am a self learner (graduated very long ago and rusty at math) working through the Riley, Hobson and Bence text, chapter 1.
1. Homework Statement
Use the fact that ##sin(\pi/6) = 1/2## to prove that ##tan(π/12) = 2 − \sqrt{3}.##
Homework Equations
##tan(2x) = \frac { 2 tan(x)} {1...
I have the coordinates of a hurricane at a particular point defined on the surface of a sphere i.e. longitude and latitude. Now I want to transform these coordinates into a axisymmetric representation cylindrical coordinate i.e. radial and azimuth angle.
Is there a way to do the mathematical...
Homework Statement
A fish floats in water with its eye at the centre of an opaque walled full tank of water of circular cross section. When the fish look upwards, it can see a fish-eye view of the surrounding scene i.e. it is able to view the hemisphere of the scene above the water surface, and...
Homework Statement
A 70 kg window cleaner uses a 16 kg ladder that is 5.6 m long. He places one end on the ground 2.0 m from a wall, rests the upper end against a cracked window, and climbs the ladder. He is 3.5 m up along the ladder when the window breaks. Neglect friction between the ladder...
For illustration purposes, I have attached an image of the line with the angle that I want to calculate. I am trying to determine the angle of rotation and the calculation that I am using currently is as below:
angle = math.atan2(y,x)
I use this formula to calculate the rotation for A and A'...
Homework Statement
Homework Equations
General Formula for Tan(a)=Tan(b)
The Attempt at a Solution
See the question I have uploaded.
I have tried solving it this way,
Firstly I applied the Quadratic Formula to get,
Now we have two cases,
CASE-1
When
So General Formula here will...
Hey guys, I would appreciate some help with the math behind creating a working coordinate system for a robotic arm. I am currently trying to determine what servo angles are necessary to align a robotic arm's claw to the given coordinates. Geometrically simplified, the robotic arm is a...
Homework Statement
##\sin a + \cos b## = ##\frac{-1}{2}##
##\cos a + \sin b## = ##\frac{\sqrt 3}{2}##
0 < a < ##\pi/2##
##\pi/2## < b < ##\pi##
a + b = ? By calculating sin (a+b)
Homework Equations
The Attempt at a Solution
I tried :
##\sin a + \cos b =...
Hi! In one of my textbook i saw the relation tan(x) = x where x is very small value and expressed in radians. I want to know why its true and how it actually works. I would appreciate someone's help :smile:
Homework Statement
##\lim_{h \to 0} \frac{f(x - 2h) - f(x + h)}{g(x + 3h) - g(x-h)}##
While f(x) = cos x
g(x) = sin x
Homework Equations
The Attempt at a Solution
Using L Hopital i couldn't make it more simple.
I tried to divide it by cos and sin
Can you give me clue?
Homework Statement
A plane is taking off from an airport directly west of the airport it wishes to touch down in. The plane in still air can travel with a constant speed of 730 km/h. If a wind is blowing constantly at 92 km/h [45° S of E], at what angle must the plane fly to compensate for the...
Mentor note: Moved thread to homework section
ok So I'm doing supposedly easy trigonometry problems. i did the easiest ones. now I have no idea how to solve 2.
first one is count
sin+cos
When
tg - (1/tg) = -(7/12)
what i figured is that i probably need to use...
I found in a book that the domain of tan x was {(2n+1)π/2 , n∈I}
The graph however shows that for every value of x , the function takes on a value .So, why is the domain like this?
Homework Statement
I am working on a report dealing with the velocity and acceleration of objects in Earth's surface based on distance from the Earth and thus far I have used the orbital speed equation and the acceleration equation. To get dive deeper into the math I would like to attempt to...
Homework Statement
Find the solution of the inequality ## \sqrt{5-2sin(x)}\geq6sin(x)-1 ##
Answer: ## [\frac{\pi(12n-7)}{6} ,\frac{\pi(12n+1)}{6}]~~; n \in Z##
Homework Equations
None.
The Attempt at a Solution
There are two cases possible;
Case-1: ##6sin(x)-1\geq0##
or...
1. Find α(β) given that the sum of the 2 sides= ##(x+y)## and its third, ##z## is a constant for 0<β<180.
You can imagine that there's two pieces of string connected between two points. One string is as long as the distance between the two points while the other string is longer. If you...
Homework Statement :[/B]
Solve for ##x ##: $$ \sin ^{-1} {x} +\sin ^{-1} {(1-x)} =\cos ^{-1} {x} $$
Answer given: ##0## or ##\frac {1}{2}##.
Homework Equations :[/B]
All relevant formulae on inverse circular functions may be used.
The Attempt at a Solution :[/B]
Please see the pic below...
Homework Statement :[/B]
Find the general solution of the Trigonometric equation: $$3\sin ^2 {\theta} + 7\cos ^2 {\theta} =6$$
Given andwer: ##n\pi \pm \frac {\pi}{6}##
Homework Equations :[/B]
These equations may help:
The Attempt at a Solution :[/B]
Please see the pic below:
It...
Homework Statement :[/B]
Find the general solution of the equation: $$\tan {x}+\tan {2x}+\tan {3x}=0$$
Answer given: ##x=## ##\frac {n\pi}{3}##, ##n\pi \pm \alpha## where ##\tan {\alpha} = \frac {1}{\sqrt {2}}##.
Homework Equations :[/B]
These equations may be used:
The Attempt at a...
Homework Statement :[/B]
Find the general solution of the Trigonometric equation $$\sin {3x}+\sin {x}=\cos {6x}+\cos {4x} $$
Answers given are: ##(2n+1)\frac {\pi}{2}##, ##(4n+1)\frac {\pi}{14}## and ##(4n-1)\frac {\pi}{6}##.
Homework Equations :[/B]
Equations that may be used:
The...
Homework Statement
Hello!
Last week I have came here for the help related to this problem. I am creating a new thread to describe the issue more precisely. I will be grateful for your help and explanation.
I post the explanation for the book first accompanied by attached pictures, and below I...
Homework Statement
In any triangle ABC, prove that $$a^2 b^2 c^2 \left (\sin {2A} +\sin {2B} + \sin {2C} \right) = 32 \Delta ^3$$
Here ##\Delta ## means the area of the triangle.
Homework Equations
The Attempt at a Solution
Homework Statement
In any triangle ABC, prove that $$ a^2 + b^2 +c^2 =4 \Delta (\cot {A}+\cot {B}+\cot {C}) $$
Homework Equations
The Attempt at a Solution
Homework Statement
Hello!
Please, take a look at the exercise I post below. I have solved it correctly, and I understand how to solve it; so no problems here. But what I do have a problem with is the size of the angle between two points. Please, see details below. I will be grateful for your...
Homework Statement
Hello!
Please, help me to understand the task - I seem to fail to understand what goes where, and hence cannot proceed to solving the exercise. Please, take a look at the task, and then my questions. The task is on using the law of sines. Before trying to solve it I need to...
Homework Statement
Hello!
Please, take a look at the following equation and help me to understand where the authors got the value of φ = π/3. I don't see where it is derived from as no additional conditions are given.
Homework Equations
x(t) = 5e(-t/5) cos(t) + 5e(-t/5) √3 sin(t)
The...
Homework Statement
Hello!
The task is to express the exact answer in interval notation, restricting your attention to -2π ≤ x ≤ 2π.
Homework Equations
The given inequality:
cos(x) ≤ 5/3
The Attempt at a Solution
I have only one doubt here, and I don't see my mistake.
I see that if cos(x)...
Homework Statement
Hello!
Please, let me know if I am heading towards a correct path in solving the equation. I get stuck in the middle, and obviously head away from the result presented in the book.
Homework Equations
cos(2x) = 2 - 5 cos(x)
The Attempt at a Solution
Gather all on one side...
Need help with a homework question!
The question gives: The first three terms of a geometric sequence are sin(x), sin(2x) and 4sin(x)cos^2(x) for -π/2 < x < π/2.
First I had to find the common ratio which is 2cos(x)
Then the question asks to find the values of x for which the geometric series...
Homework Statement
Homework Equations
Gamma factor:
$$\gamma = \frac{1}{\sqrt{1-\beta^2}} $$
Lorentz contraction
$$l'=\frac{l}{\gamma}$$
Trig:
$$ cos\theta = \frac{adjacent}{hypotenuse}$$
The Attempt at a Solution
I have all the quantities but the algebra doesn't seem to work out...
Hi! New to this forum and signed up because I've just started a foundation degree in mechanical engineering, and having been out of education for a very long time beforehand, getting back to grips with mathematics and the like!
Anyway, I would like to ask for some advice on this problem, I know...