$\lim_{x\to0}\left(\frac{1-x-lnx}{1+cos\left(\pi x\right)}\right)$
$-3\:x-4y+4y-x$
$\frac{dx}{dy}+x=y$
$-20>4-4x$
$3x^4+6x^2$
$2\cdot3\cdot\left(-4\right)$
$\int_1^e\pi\left(lnx\right)dx$
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