$-2\cot^2$
$\left(d^2-9\right)\left(d^2-16\right)$
$\left(3x-4b\right)^2$
$\frac{d}{dx}sin^4x$
$\int csc^4\left(4x\right)\cot\left(4x\right)dx$
$\int\frac{x^2-4x+9}{x+1}dx$
$\frac{x+2}{3}<x-\frac{1}{2}$
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