# trigonometery

1. ### Jenkins-White Optics: Relation between Prism/Deviation Angle and Rays

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...
2. ### Project Motion/Trigonometry Question

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...

13. ### I Why tan x=x as x approaches 0?

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:
14. ### Find the limit as h --> 0 for this trigonometery equation

1. 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 2. Homework Equations 3. 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?
15. ### Kinematics -- flying a plane in the wind to a destination

1. 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...
16. ### Intro Math Books on Spherical Trigonometry

What are some good books to learn spherical trigonometry from basics to the advanced level?
17. ### Trigonometry: count sin+cos when tg-ctg=-7/12

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...
18. ### B Domain of tan

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?
19. V

### Calulate the distance of objects in Earth's orbit

1. 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...
20. ### Trigonometric inequality problem.

1. Homework Statement Find the solution of the inequality $\sqrt{5-2sin(x)}\geq6sin(x)-1$ Answer: $[\frac{\pi(12n-7)}{6} ,\frac{\pi(12n+1)}{6}]~~; n \in Z$ 2. Homework Equations None. 3. The Attempt at a Solution There are two cases possible; Case-1: $6sin(x)-1\geq0$ or...
21. ### Finding an angle of a triangle as function of another angle

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...
22. ### A problem in Inverse Circular Functions in Trigonometry

1. Homework Statement : Solve for $x$: $$\sin ^{-1} {x} +\sin ^{-1} {(1-x)} =\cos ^{-1} {x}$$ Answer given: $0$ or $\frac {1}{2}$. 2. Homework Equations : All relevant formulae on inverse circular functions may be used. 3. The Attempt at a Solution : Please see the pic below. I...
23. ### Problem in finding the General Solution of a Trigonometric Equation v3

1. Homework Statement : Find the general solution of the Trigonometric equation: $$3\sin ^2 {\theta} + 7\cos ^2 {\theta} =6$$ Given andwer: $n\pi \pm \frac {\pi}{6}$ 2. Homework Equations : These equations may help: 3. The Attempt at a Solution : Please see the pic below: It seems...
24. ### Problem in finding the General Solution of a Trigonometric Equation v2

1. Homework Statement : 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 $\tan {\alpha} = \frac {1}{\sqrt {2}}$. 2. Homework Equations : These equations may be used: 3. The Attempt at a...
25. ### A problem in finding the General Solution of a Trigonometric Equation

1. Homework Statement : 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 $(4n-1)\frac {\pi}{6}$. 2. Homework Equations : Equations that may be used: 3. The...
26. ### Graph r = 6 cos() issues with plotting on xy-plane

1. 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...
27. ### A problem in Trigonometry (Properties of Triangles) v3

1. 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. 2. Homework Equations 3. The Attempt at a Solution
28. ### A problem in Trigonometry (Properties of Triangles) v2

1. Homework Statement In any triangle ABC, prove that $$a^2 + b^2 +c^2 =4 \Delta (\cot {A}+\cot {B}+\cot {C})$$ 2. Homework Equations 3. The Attempt at a Solution
29. ### Understanding the size of the angle

1. 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...
30. ### Find the height of the tree - understanding the task

1. 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...