$\int\frac{cos^2\left(4x\right)}{sen^3\left(4x\right)}dx$
$x^3+2<0$
$\frac{x^2-x+3}{x^2+3x-1}$
$a^2-\:4ab\:+\:4b^2\:$
$-1\cdot2x-1$
$\int_1^{\infty}\left(\frac{x}{\sqrt{x^4-1}}\right)dx$
$\left(6a\:-\:b\:+\:c\right)\:-\:\left(6a\:+\:10b\:-\:c\right)$
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