$3\:\le8+x$

$-12y^2-30y^2+4y^2$

$\frac{1-\cos\left(a\right)}{\frac{\sin\left(a\right)}{\frac{1+\cos\left(a\right)}{\sin\left(a\right)}}}$

$\sqrt[4]{y^5}$

$9^2+30n+25$

$\left(a^{x+1}+1\right)^2$

$\frac{\sin\left(x\right)\cdot\cos\left(x\right)}{1-2\cos\left(x\right)}=\frac{1}{\tan\left(x\right)-\cot\left(x\right)}$