$\left(5xy^2-4x^2y\right)^2$
$5x^2+19x-4=0$
$\sin3x-\sin x$
$\left(6x-3xt\right)^3$
$81^{x-2}=3^{3x+7}$
$\int-7\cdot\sec^2\left(3-7x\right)dx$
$\frac{d}{dx}y=\tan\left(5x^2\right)$
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