$\int x^3e^{-x}\sin\left(x\right)dx$
$7x-3y+4z-12x-5y+2z-8y-3y$
$\lim_{x\to0}\left(\frac{\left|x\right|^3}{x^2}\right)$
$\log\left(\frac{y^4}{\sqrt{xz^7}}\right)$
$-2a\:+4$
$\int2x^5\:-3x^2+x^{-3}\:dx$
$\int\sin4\:t\:dt$
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