$x\sin\left(x\right)-x\cos\left(x\right)$
$2x^5-16x^2-32x$
$\int\left(2f^2-1\right)^2dx$
$2xyx'=\left(x^2-1\right)$
$\left(5a^2\right)\left(a+1\right)$
$\int x\left(\frac{1}{x^2+4x+3}\right)dx$
$\left(-4x-8y-4a^2\right)^2$
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