$\frac{\cos+\cos\sin}{\cos^2}$
$4a-9b+23a-17b$
$\lim_{x\to0}\left(\frac{3-x}{2+x}\right)^0$
$\frac{d}{dx}\left(4\sin\left(4x^2-3\right)\right)$
$3000-2622.07143$
$\int_{-1}^2\pi\left(\left(x-3\right)^2-\left(x+1\right)^2\right)dx$
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