$i^2-20$
$\tan\left(x\right)-\sec\left(-x\right)$
$\frac{\sin\left(x\right)}{1-\cos\left(x\right)}-\frac{1}{\tan\left(x\right)}=\frac{1}{\sin\left(x\right)}$
$2\left(3\left(2\right)-\left(-1\right)\right)$
$\int\frac{\sin\left(2x\right)}{cos^32x}dx$
$\frac{x^3-2x^2+3x-4}{x-1}$
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