$64x^{14}-0,36a^{20}$
$\frac{tan^2\left(\theta\:\right)}{\tan\:^2\left(\theta\:\right)+\:1}=sen^2\left(\theta\:\right)$
$\left(a^{x+1}+2bx\right)\left(2bx-a^{x+1}\right)$
$\left(2x+2\right)\left(x+1\right)$
$\int\frac{\sqrt{4-\:x^2}}{x^2}dx$
$x-12^2$
$\sin^2u\left(1+\cot^2u\right)$
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