$\int x\cdot sen\left(x\right)\cdot\cos\left(nx\right)dx$
$\frac{1}{y^2-y}dy=\frac{1}{x}dx$
$\left(2m+5n-2\right)^2$
$\lim_{x\to\infty}\frac{x-6}{x^2+4x+7}$
$x+4<3x-2$
$4sen^2x-9\cos^2x=0$
$-3\left(1-3x\right)\leq12x$
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