$\frac{cos\left(2\theta\right)}{sin^2\left(\theta\right)}=cot^2\left(\theta\right)-1\:$
$\int x^3e^{-4}dx$
$14x^2y^2-28x^3+56^4$
$8x^3+6x^3+11a-3a$
$-2c+5c-9=3\left(c-4\right)-5$
$4r^3t^2-6t^2r^3+3rt-16$
$5x^2+6x-8$
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