$\left(cot\theta\:\right)\left(cot\theta\:-tan\theta\:\right)$
$63-\left(-35\right)$
$\int\frac{\ln\left(^2\right)}{x}dx$
$\frac{6x^3-6x^2+3x}{3x}$
$\left(2y^2+2xy^2\right)\left(2xy+3\right)$
$\frac{\cos\left(t\right)\cot\left(t\right)}{1-\sin\left(t\right)}-1$
$\int-2x^6dx$
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