$\cot2\theta=\frac{1}{2}$
$\int\left(2x+1\right)\sin^2\left(2x^2+2x-1\right)dx$
$m+-37=-59$
$\frac{8x^2+2x}{4x+1}$
$\:\left(r-t\right)^4$
$x+2=2x+7$
$\frac{dy}{dx}=x^3-y$
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