$\frac{2\tan\left(x\right)}{1+\tan^2\left(x\right)}\cdot\cot\left(2x\right)$
$\left(9y-7z\right)^3$
$xdy-ydx$
$x^4+4x-5$
$\frac{\frac{1}{2}x+x-\frac{3}{4}}{x^2+3}$
$a+3a-4\left(9-a\right)$
$-2a-\frac{1}{3}a+2a$
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