$cot\left(\frac{\pi}{2}-\left(x\right)\right)\cot\left(x\right)=1$
$y'=\frac{1}{x^2cosy+x^2}$
$\sqrt{x+15}=0$
$\left(a^5+2x^2c\right)^3$
$4\sqrt{-75}+3\sqrt{-27}$
$\frac{2}{3}+\frac{400}{3}$
$6^{-4}\cdot6^6$
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