$\frac{\cot^2\left(x\right)-1}{1+\cot^2\left(x\right)}=\cos2\left(x\right)$
$\int\left(x^3\:-\:5x\:+\:3\right)^2\:\left(3x^2-\:5\right)dx$
$\int\frac{1280}{\left(15.08-0.128t\right)^2}dt$
$\frac{x^2+x}{6x^2+x}$
$6x^2-18x+8$
$-56x\:-x$
$3+2\left(-a-4\right)-\left(5a-3\right)+a$
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