$\pi\left(x-2\right)\left(x-1\right)$
$\frac{4a^2}{5mn};a=3;b=2;m=1;n=4$
$-\left(2x+5\right)^3$
$\frac{\sqrt{1+0}-\sqrt{1-0}}{0}$
$\frac{1}{\cos x+1}+\frac{1}{\cos x-1}=-2\cot\left(x\right)\csc\left(x\right)$
$\int9x^8e^{7x^9}dx$
$-18x+8=x^2$
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