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pi-π
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9
A spherical ball of salt is dissolving in water
Apr 25, 2018
8
The sum of digits in a 2-digit number
Jan 4, 2017
8
Help with this trigonometry problem
Aug 17, 2016
8
Prove: If $x+y+z=xyz$ then $\frac {x}{1-x^2} +\frac {y}{1-y^2} + \frac {z}{1-z^2}=\frac {4xyz}{(1-x^2)(1-y^2)(1-z^2)}$
Feb 1, 2017
7
Integrate $\int \frac {\sin (2x)}{(\sin x+\cos x)^2}\,dx$
May 6, 2019
7
Prove: $\cos^3{A} + \cos^3{(120°+A)} + \cos^3{(240°+A)}=\frac {3}{4} \cos{3A}$
Sep 10, 2016
6
Consider an isosceles triangle
Apr 1, 2017
6
In any $\triangle ABC$, prove that: $\frac {\cos B-\cos C}{\cos A +1}=\frac {c-b}{a}$
Apr 8, 2018
5
If sides $a$, $b$, $c$ of $\triangle ABC$ are in arithmetic progression, then $3\tan\frac{A}{2}\tan\frac {C}{2}=1$
Apr 11, 2018
5
Evaluating: $\int \frac {1+\sin (x)}{1+\cos (x)} dx$
Jan 24, 2018