$\left(1-sen^2b\right)\left(1+tan^2b\right)=1$
$\frac{1}{x^2-2x}$
$25n^2\:-\:30n\:+9$
$2y^2+y^2$
$\int_{\pi}^{2\pi}\left(x.\cos\left(2x\right)\right)dx$
$\left(x+\frac{1}{2}\right)\cdot\left(x+\frac{3}{2}\right)$
$\int3x^5\sqrt{8x^6+3}dx$
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