$5\cdot7+8$
$\left(-cos^2x\right)\left(cot^2x\right)$
$2x+7y-5x-2y-y+5x-y$
$\lim_{x\to-4}\left(\frac{4-\left|x\right|}{4+x}\right)$
$\frac{1}{2}\left(1^2+4^3+3^1\right)$
$\int\left(\frac{\frac{1}{3}cos^2x-\frac{1}{4}tanx}{cosx}\right)dx$
$\frac{3x^8-6x^2+5x}{x+2}$
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