$3cot^2z+7cotz+2$
$5c^2-39c+25=c^2+2c-75$
$\frac{\cos^2x}{\left(1+\sin x\right)\left(1-\sin x\right)}=1$
$\left(x+y^2\right)dx+2yxdy$
$5x-3x^2+1$
$\int\frac{\cot\left(x\right)}{\cot^2\left(x\right)-1}dx$
$7r=-63$
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