$\int_0^{\pi}cos^2xsen^4xdx$
$\left(-7a^2+2\right)\left(7a^2-2\right)$
$2\:3\:1\:7=x$
$x^2+y^2-1+1$
$-3y^2+1-y^2$
$\lim_{x\to\infty}\left(\frac{-2x^2+5x}{4x^3-2x+1}\right)$
$-3\left(-2a-3b+6c-8\right)$
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