$\frac{\left(2-a\right)\left(a+4\right)}{a-3}$
$\int\frac{4}{\sqrt{9-x^2}}dx$
$-\frac{1}{x}\cdot x^2$
$4x+2x=54$
$\int\arccos zdz$
$y^2-7y+30$
$\left(1+\cos^2b\right)\left(1+\tan^2b\right)=\frac{1}{cot^2}$
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