$\left(2x\:cos\:y\:-\:y\:cos\:x\right)\:dx+\left(-x^2\:sen\:y\:-\:sen\:x\right)dy=0\:$
$\int\left(-\frac{x}{\sqrt{4-9x^2}}\right)dx$
$\lim_{x\to0}\left(cos3x-2\cos\left(x\right)\right)$
$d\left(2x+1\right)$
$x^2\frac{dy}{dx}-x=1+y+xy$
$\int\:\frac{x^5}{\sqrt{1-3x^3}}dx$
$46\cdot12$
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