$\frac{d^4}{dx^4}\left(\cot\left(x\right)\right)$
$2ab+2a-b-1$
$sen^2\left(4x\right)=\frac{1-cos\left(8x\right)}{2}$
$\int x\left(5x^4-8x^3+6\right)dx$
$3\cdot\left(2+3\right)$
$-xp^2+p$
$\frac{d}{dy}\left(-y\right)$
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