$4x^2-2y^2dx=2xydy$
$\frac{1}{2}\int\left(x^2+2\right)^3xdx$
$\left(-3\right)\cdot\:\left(+3\right)\cdot\:\left(+3\right)\cdot\:\left(-3\right)$
$7k\:-\:2\left(k\:-\:1\right)$
$7f-4f+3d-2d+2f$
$\tan^2x-\sec^298$
$\sqrt{7\cdot4+28-2}$
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