$\int\frac{2\cos2x}{\sin^22x}dx$
$f\left(x\right)=\sec\left(2x-x^3\right)$
$28\cdot2$
$16+x=12$
$a\:\left(n\:+\:2\right)\:+\:n\:+\:2\:$
$\left(\frac{4}{5}x^3y^2-\frac{1}{3}xy\right)\left(\frac{4}{5}x^3y^2+\frac{1}{3}xy\right)$
$-4a^5\:+\:a^5\:-\:7a^5$
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