$x\frac{dy}{dx}-y=x^3\sin x$
$\left(-1\right)\:\left(9\right)\left(10\right)\left(2\right)\left(4\right)\left(5\right)$
$\left(x-3\right)\left(x+20\right)$
$16m^6-2m^3n^2+\frac{h^4}{16}$
$\int\frac{x^3+x-1}{x\left(x+1\right)}dx$
$\sec^2\left(x\right)\cos^2\left(x\right)+\tan^2\left(x\right)$
$\frac{1}{cos^2\left(t\right)}-1=\tan^2\left(t\right)$
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