$y^2+3=x-y$
$\sin\left(\frac{1}{4}\right)x=0$
$\ln\left(\left(x^2+1\right)\left(x-1\right)\right)^3$
$-x^3+3.x^3$
$\lim_{x\to0}\left(\frac{2}{x}-\frac{1}{e^{3x}-1}\right)$
$\frac{d}{dx}sin2x-cosx-4x$
$\int\:\:-\frac{3x^2}{\sqrt{1-x}}dx$
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