$\lim_{x\to\infty}\left(\frac{x^2}{x^2+4x+4}\right)$
$\int\left(\sin\left(-4x\right)\right)dx$
$\left(-4a^9-2\right)\left(-4a^9+7\right)$
$x^2+3x-5=y$
$\int\frac{sec\:3x}{cot\:3x}du$
$\left(x^2-2x+1\right)^2-\left(x^2-2x+2\right)^2$
$\int-25cos\left(5x\right)^3sen\left(5x\right)dx$
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