$\frac{10n^7}{-4n^3}$
$\frac{dy}{dx}-5x^4=5x^4y^2$
$\int sinx\sqrt{1+cosx^2}dx$
$-85\:-\:4x\:<\:10x\:+\:167$
$2\left(2x^2+y^2\right)dx+xydy=0$
$\left(3\cos x+7\right)\left(-2\sin x-1\right)$
$\lim_{x\to\infty}\left(\frac{x-4}{x+2}\right)$
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