$-x^3+3x+2$
$\int\frac{1}{\left(x+1\right)\left(x^2+2x+2\right)}dx$
$\frac{sin\left(1+cos\right)}{1-cos\left(1+cos\right)}$
$\frac{\left(tanx+cotx\right)}{cotx}$
$\left(c+2\right)\left(c-4\right)$
$\frac{\sin\:\left(2x\right)+\sin\:\left(3x\right)}{\cos\left(2x\right)-\cos\left(3x\right)}$
$\frac{ab}{2}-\frac{ba}{3}$
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