How to solve this $80^\circ$-$80^\circ$-$20^\circ$ triangle ($60^\circ+20^\circ$ and $70^\circ+10^\circ$ variant)?
40615
Solve for $x$ in the $80^\circ$-$80^\circ$-$20^\circ$ triangle
45343
Solve $\cos^{n}x-\sin^{n}x=1$ with $n\in \mathbb{N}$.
156468
Solutions to $a+b+c=12$, $a, b, c \in \mathbb{N}_0$
70147
Solving $x^4 -10x^3 + 26x^2 -10x +1 = 0$.
32705
Trigonometric Equation : $\sin 96^\circ \sin 12^\circ \sin x = \sin 18^\circ \sin 42^\circ \sin (12^\circ -x)$
54608
How to find all solutions of $4^x-3^x=1$?
17741
Quick way to solve the system $\displaystyle \left( \frac{3}{2} \right)^{x-y} - \left( \frac{2}{3} \right)^{x-y} = \frac{65}{36}$, $xy-x+y=118$.
54929
Finding integer solutions for $6x+15y+20z=1$
42391
Calculate $\tan9^{\circ}-\tan27^{\circ}-\tan63^{\circ}+\tan81^{\circ}$
47378
draw $\triangle ABC$ in which $AB=5.5$cm, $\angle C =40^{\circ}$ and $BC-AC=2.5$cm
83332
Trig sum: $\tan ^21^\circ+\tan ^22^\circ+\cdots+\tan^2 89^\circ = \text{?}$
26898
Trouble solving two number theoretical problems
37744
Prove that given $a,b,c > 0$, it is possible to construct a triangle with sides of length $a,b,c$ if and only if $pa^2+qb^2 > pqc^2$
20491
How to solve this equation $x^{2}=2^{x}$?
156596
Prove $r^2+r_1^2+r_2^2+r_3^2=16R^2-a^2-b^2-c^2$ for a triangle with sides $a$, $b$, $c$, circumradius $R$, inradius $r$, exradii $r_1$, $r_2$, $r_3$
85571
How do I simplify $\sqrt{3}(\cot 70^\circ + 4 \cos 70^\circ )$?
40919
Finding an angle within an 80-80-20 isosceles triangle