$\lim_{x\to\infty}\left(\frac{4x^4+4x^2+1}{x^2-2x-1+x^2+x}\right)$
$\frac{d^2}{dx^2}\left(16x^3-32x^2\right)$
$\frac{a^5}{a^7}.a^2$
$x^2+6x-4=0$
$-9-\left(-4\right)-2$
$5x^2+x-15\:para\:x=2$
$\frac{\cos\left(\theta\:\right)+1}{\sin\left(\theta\:\right)}$
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