$\int\left(x^2+4x\right)\cos\left(x\right)dx$
$x^2\:-\:20x\:+\:x^2\:+\:3x\:$
$f^2+40f+720$
$-16-4\cdot4$
$400x^6-900x^4y^6$
$\lim_{x\to2}\left(\frac{\sqrt{x^2-4}}{2x^2-8}\right)$
$\int_{\pi}^{2\pi}\left(\cos\infty\right)dx$
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