$\left(ax+c\right)\:\left(2ax-c\right)$
$2+\frac{18}{x}$
$\cot^2a=\cos^2a+\cot^2\cdot\cos^2$
$-35=x-21$
$-4x^2+20x+56$
$\left(n^2+5p\right)^2$
$\int e^{-\frac{x}{3}}\cos\left(2x\right)dx$
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