$\frac{d^4}{dx^4}\left(\cot\left(x\right)\right)$
$20x^2+50x-70$
$cos\left(\frac{\pi}{2}-\frac{\pi}{6}\right)$
$21d+18$
$\int_{-1}^1\left(\frac{16}{x^5}\right)dx$
$-x+4\le7$
$2x+4=3x-18$
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