$\cos\frac{\pi}{2}-x$
$\left(x+y\right)\cdot\left(x\right)$
$\int\frac{2x^2+x+3}{\left(x+1\right)\left(x^2+1\right)}dx$
$\left(5x^2+1\right)^4$
$3x^2-2-6$
$8\left(2a-4\right)$
$40x^3\:y-51x^3\:y$
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