$\frac{dy}{dx}\left(y=x^2\sin\left(2x\right)\right)$
$\frac{2\sin x}{\cos x}\cdot\frac{\cos x+1}{\cos x-1}$
$75^2\cdot6m^4v^5$
$\left(m^2-5m+4\right)\left(m^2+7m-3\right)$
$-6\:.\:15$
$\sec x+\cos^2x$
$\frac{4}{6x^6}$
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