$\int\left(\frac{x}{12\:+\:x^4}\right)dx$
$\frac{1}{cos^2a}+\left(1+tga\right).\left(1-tga\right)$
$\frac{dy}{dx}-4y=xe^x$
$-39\:+1\:\left(-46\right)$
$\int\frac{2}{\sqrt{x}\left(1+2\sqrt{x}\right)^7}dx$
$\frac{dy}{dx}=4-4x-2y+xy^2$
$4x-3>1$
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