Find $x$ in this $80^\circ$-$80^\circ$-$20^\circ$ triangle ($60^\circ$-$70^\circ$ variant)
40615
Solve for $x$ in the $80^\circ$-$80^\circ$-$20^\circ$ triangle
148535
Finding the "triangular root" of a number.
15436
Find p and q s.t. $({p-1})^{q-1}+({q-1})^{p-1} \equiv 101 \pmod {pq}$
18093
Find $x$ such that $\sum_{k=1}^{2014} k^k \equiv x \pmod {10}$
142673
Evaluate $\tan^{2}(20^{\circ}) + \tan^{2}(40^{\circ}) + \tan^{2}(80^{\circ})$
28096
Finding the derivative of $x\uparrow\uparrow n$
130639
Find the maximum area possible of equilateral triangle that inside the given square
5868
Find the real number $x$ represented by continued fraction $[12;2,2,12,2,2,12,2,2,12\dots]$
146753
Find $x$ such that $(x^2 + 4x + 3)^x + (2x + 4)^x = (x^2 + 4x + 5)^x$
12414
prove that : $\cos x \cdot \cos(x-60^{\circ}) \cdot \cos(x+60^{\circ})= \frac14 \cos3x$
15897
Solve a congruence $1978^{20}\equiv x\pmod{125}$
31122
How could I find $x$ in this equation $x^2-x+6 \equiv 0 \pmod {9}$
69631
Prove that: $ \cot7\frac12 ^\circ = \sqrt2 + \sqrt3 + \sqrt4 + \sqrt6$
42852
The legs of a right triangle with given hypotenuse and radius of inscribed circle
60769
How to solve x^x = const?
103988
Prove that $\tan20^°\tan40^°\tan60^°\tan80^°=3$
94217
Solve the equation $x^n=a$ in a finite field