General Math Forum

Post thread
Join in expert discussion on general math topics that are not applicable to the specific categories. This includes topics are usually high school math level. Homework help is available.

Math Proof Training and Practice

A gap in resources that should help students visualise mathematics

Math Guides, Tutorials and Articles

MHB Deriving the first and second order Newton-Cotes formulas

Math Problem of the Week

Undergrad Sum of an Alternating Series
Undergrad Best way to solve a system of complex equations?
  • · Replies 5 ·
Replies
5
Views
3K
MHB So the exact value of Cos(-pi/3) is 1/2.
  • · Replies 2 ·
Replies
2
Views
12K
Undergrad Trigonometry: Analyzing and Graphing a Cosine Function
  • · Replies 13 ·
Replies
13
Views
2K
MHB Evaluate $\frac{z-y}{z-x}$ for $x,\,y,\,z$ Real Numbers
  • · Replies 3 ·
Replies
3
Views
2K
MHB Prove the product is less than or equal to 1
  • · Replies 2 ·
Replies
2
Views
2K
MHB Equations for Lagrange-Laguerre mesh
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Find D: [(A - D)^P] / [(B - D)^R] = (C - D)^(P - R)
  • · Replies 10 ·
Replies
10
Views
2K
High School Cool ways to use the Pythagorean Theorem
  • · Replies 30 ·
2
Replies
30
Views
4K
MHB Solving for $a\times b \times c$: Equations (1), (2), and (3)
  • · Replies 6 ·
Replies
6
Views
2K
MHB Solving for $x+y$ in $\triangle ABC$
  • · Replies 3 ·
Replies
3
Views
1K
Graduate How does ifft(fft(x)) form the correct bijection with domain?
  • · Replies 1 ·
Replies
1
Views
2K
High School Is a Ton of Styrofoam the Same Weight as a Ton of Steel?
  • · Replies 3 ·
Replies
3
Views
1K
MHB Find the Sum of k when $k\in N$ and $\sqrt {k^2+48k} \in N$
  • · Replies 5 ·
Replies
5
Views
2K
High School Easiest way to learn exact values for trig functions?
  • · Replies 15 ·
Replies
15
Views
2K
Graduate One conjecture stronger than another?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Predict Digits of Irrational Numbers with Modular Arithmetic Summation?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Modulo Notation: Is There a More Efficient Way to Represent Modular Functions?
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Optimizing Across Noisy Domain
  • · Replies 5 ·
Replies
5
Views
1K
High School Graph something freehand, then it gives the function...how?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Prime Numbers Between Two Quadratics: A Useful Result?
  • · Replies 1 ·
Replies
1
Views
1K
High School How to Memorize Even and Odd Functions?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Is Infinity the Identity Element in Some Operations?
  • · Replies 4 ·
Replies
4
Views
2K
High School How do we write mathematical symbols on whatsapp or google
  • · Replies 3 ·
Replies
3
Views
28K
High School Dumb Question: Why Do You Add Exponents When Multiplying?
  • · Replies 5 ·
Replies
5
Views
2K
MHB Prove Inequality for $x,y,z$ Positive Real Numbers
  • · Replies 1 ·
Replies
1
Views
2K
MHB Find the positive integer solutions
  • · Replies 2 ·
Replies
2
Views
2K
MHB Prove $\prod_{k=1}^{2015} (1+\frac{1}{(2k+1)^3})< \frac{\sqrt{5}}{2}$
  • · Replies 5 ·
Replies
5
Views
2K
MHB Interval Notation of Inequality: -9<1/x<=1
  • · Replies 10 ·
Replies
10
Views
3K
Graduate Is there a formula for generating prime numbers and proving their primality?
  • · Replies 69 ·
3
Replies
69
Views
10K
MHB Inscribed circle in the triangle
  • · Replies 2 ·
Replies
2
Views
2K
Graduate How Does MIT's New Algorithm Revolutionize Optimization Speeds?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad "Crow Flies Distance" On a Rectangular Grid -- Definition?
  • · Replies 7 ·
Replies
7
Views
2K
MHB What is x in Trig Problem with given constraints?
  • · Replies 4 ·
Replies
4
Views
2K
High School What does function mean in mathematics?
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad 185 stored as a signed 8-bit number?
  • · Replies 3 ·
Replies
3
Views
6K
Undergrad Solve Trig Equation with 2 & -Π/6 Inside Brackets
  • · Replies 2 ·
Replies
2
Views
2K
High School I want to do math and physics but my math skills are poor
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Finding the number of solutions to a given function/equation
  • · Replies 5 ·
Replies
5
Views
2K
MHB Factoring Polynomial Equations
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad How to change the modulus of congruence
  • · Replies 1 ·
Replies
1
Views
1K
Three greatest mathematicians ever?
  • · Replies 18 ·
Replies
18
Views
4K
MHB Find $\angle BPC$ in Triangle ABC with $\angle ACB=\angle ABC=80^\circ$
  • · Replies 14 ·
Replies
14
Views
4K
Undergrad Where does this equation for an ellipse come from?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Need verification of an equation
  • · Replies 4 ·
Replies
4
Views
930
Undergrad Finding the Sum of an Alternating Geometric Sequence
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Factoring Polynomials of Any Degree: Can Complex Numbers Help?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Understanding Homogeneous Equations in Coordinate Geometry
  • · Replies 2 ·
Replies
2
Views
1K
Graduate A link from complex number to hypercomplex numbers
  • · Replies 3 ·
Replies
3
Views
1K
MHB Equation with logarithm in power
  • · Replies 10 ·
Replies
10
Views
3K
Graduate 10-adic number proof: A^10 has the same n+1 last digits as 1
  • · Replies 1 ·
Replies
1
Views
1K
High School Algebra help isolating a variable
  • · Replies 2 ·
Replies
2
Views
1K
MHB Max of $st+tu+uv$ given $s,t,u,v$ sum 63
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Help in proving this inequality
  • · Replies 3 ·
Replies
3
Views
2K
To be a great mathematician/physicist, must one start young?
  • · Replies 7 ·
Replies
7
Views
2K
High School Question About Unit Circle (CircularFunction) of a Trig Func
  • · Replies 6 ·
Replies
6
Views
1K
Undergrad Is there any indication the Egyptians understood coprimes ?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Is It Possible to Solve an Equation with Two Unknowns?
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Why is 1/3 considered a number line point when .333.... isn't
  • · Replies 15 ·
Replies
15
Views
2K
High School Math Rules: Learn Essential Math Principles Easily
  • · Replies 7 ·
Replies
7
Views
2K
MHB Solve for integer solutions
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Can B-splines cause oscillations in second derivatives?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Understanding the Finite Value of ##\zeta(-1)##
  • · Replies 3 ·
Replies
3
Views
2K
High School What Are Real Roots in Mathematics?
  • · Replies 10 ·
Replies
10
Views
2K
MHB Can You Prove This Trigonometric Inequality?
  • · Replies 3 ·
Replies
3
Views
2K
High School Understanding Quadratic Inequality: Explained in Detail
  • · Replies 7 ·
Replies
7
Views
2K
MHB Trig Assistance for CNC Machining/Engineering
  • · Replies 10 ·
Replies
10
Views
4K
Insights Proofs in Mathematics - Comments
  • · Replies 27 ·
Replies
27
Views
5K
Undergrad Inverse Functions: Evaluating a Question on Compositions
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Power of discrete sinusoidal signal?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad How Does cos(θ)sin(θ+φ)-sinθcos(θ+φ) Simplify to sinφ?
  • · Replies 4 ·
Replies
4
Views
2K
MHB Factoring Problem: Converting [-s(s-(s-1)-2s+n(n+1)] to (n-s)(n+s+1)
  • · Replies 1 ·
Replies
1
Views
1K
MHB Calculating angles for a physical regular icosahedron
  • · Replies 2 ·
Replies
2
Views
3K
High School Help Me Comprehend This.... (change of units)
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Defining a function (Discrete Math)
  • · Replies 9 ·
Replies
9
Views
2K
MHB Solving Inequality Problem: Proving Radical Expressions with Cube Roots
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Summation sign for composition
  • · Replies 6 ·
Replies
6
Views
1K
Graduate Can a cubic polynomial be solved without arccos?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad I with multiplying rational exponents
  • · Replies 5 ·
Replies
5
Views
1K
MHB Finding an unknown 3-digit number
  • · Replies 3 ·
Replies
3
Views
3K
MHB Composition of Transformations
  • · Replies 2 ·
Replies
2
Views
5K
MHB Solving Quadratic Equations: m^4+4m^3+8m^2+8m+4=0
  • · Replies 11 ·
Replies
11
Views
4K
MHB Trigonometric Identities Problem
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Solve Word Problem: Average # Lunar Months/Year for Tegummans
  • · Replies 9 ·
Replies
9
Views
2K
High School How to Plot Number Lines with Software
  • · Replies 2 ·
Replies
2
Views
1K
MHB How to Find Cosine from Secant Using Trig Identities?
  • · Replies 2 ·
Replies
2
Views
2K
MHB Where Can I Find a Math Search Engine or Equation Identification Tool?
  • · Replies 2 ·
Replies
2
Views
2K
High School Why Is the Slope Between Perpendicular Lines -1, But Not for the X and Y Axes?
  • · Replies 11 ·
Replies
11
Views
3K
High School Why do we use division when we use per something?
  • · Replies 6 ·
Replies
6
Views
2K
High School Finding sin and cos without using calculator
  • · Replies 6 ·
Replies
6
Views
4K
Undergrad Cross product imaginary numbers
  • · Replies 2 ·
Replies
2
Views
1K
High School Graphs, equation and functions.
  • · Replies 7 ·
Replies
7
Views
1K
Graduate Lambert W function with rational polynomial
  • · Replies 7 ·
Replies
7
Views
4K
High School Absolute Value Inequalities: Solving for x
  • · Replies 3 ·
Replies
3
Views
2K
MHB How can I show b^2 > 24c in a cubic with one maximum and one minimum?
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad What really is the meaning the verb "induces," in math?
  • · Replies 8 ·
Replies
8
Views
6K
Undergrad Is there any pyramid like that?
  • · Replies 10 ·
Replies
10
Views
1K
MHB Can You Solve This Trigonometric Equation for $x$?
  • · Replies 4 ·
Replies
4
Views
2K
MHB Solving equation of floor function
  • · Replies 2 ·
Replies
2
Views
2K
MHB Solving for U & P in a Coordinate Change
  • · Replies 1 ·
Replies
1
Views
1K
MHB Cross-Border Conversions: Miles to Kilometers
  • · Replies 1 ·
Replies
1
Views
1K