$\left(-8\right)-\left(-3\right)$
$\left(1-\cos\left(x\right)\right)\cot\left(\frac{1}{2}x\right)$
$\int\:9x\:dx$
$15-6a^3+3-2a^3-3b-9b$
$25y^2-z^2$
$\left(a^2+b^2\right)\left(x^2+y^2\right)$
$\int\cos\left(1\right)^3xdx$
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