Mathematics
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Math is Fun

Algebra

A little trick for square

Inequality and absolute values

Taylor Expansion & inequality

Geometry

3x pairs of triangles

Symmetry for 30$^\circ $ angle

Numbers

***Squares, squares

***Trick of 999 x 999

Why is 5 special

Permutation and combination

6A and 6B

Sample space of 3 cards

Probability

Coin and die

Cupcakes

Letters

Probability of probability

Trigonometry

Derivatives of inverse trig functions make sense

**Law of sine makes it easy

*** New formula for sine values of 9 special angles?

Range of sine function

Sum to product

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Top posts (172)

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7 Is this a circular proof of Pythagorean Theorem? If not, are there better ones? [duplicate] Mar 8
7 Where should a water pump be placed to minimize the length of the pipe? Mar 23
6 Why is this the trick to calculate $m\, 9$s $\times n\, 9$s? Mar 4
4 Is $\cos(2\theta)=\frac{2e^{i\theta}+2e^{-i\theta}}2$ a correct application of Euler's Formula? Apr 6
4 Combinatorics Problem - Identical Balls Apr 24
4 What is $\lim\limits_{x \to \infty}\dfrac{\sqrt{x^2+1}}{x+1}$? Apr 25
4 The value of $\sin{(135^\circ-2\alpha)}\cdot\sin{(\alpha-45^\circ)+\cos^2{(75^\circ-\alpha)}}-2\sin{(\alpha-30^\circ)}$ when $\alpha=60^\circ$ May 22
3 Show that there is a simultaneously tangent line to both the curves $y = e^x$ and $y = \ln x$ Apr 2
3 Represent $x_1=\frac{1-\sqrt{37}}{3}$ and $x_2=\frac{1+\sqrt{37}}{3}$ on a number line Apr 4
3 Proving that in a quadrilateral $ABCD$, where $P$ is the intersection of angle bisectors of $BAD$ and $ADC$, $|BP|=|CP|$ Mar 28
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