$x^3\frac{dy}{dx}+2y=x$
$\frac{\left(21\times81\right)^{3}}{343}$
$\sec y+\tan y$
$200\:+\:5\:-2$
$\int\left(\frac{7}{\sin^2\left(x\right)}\right)dx$
$x^3-5x+7;\:x=-3$
$3a^2b+6ab-5a^3b^2+8a^2bx$
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