$\int\left(\frac{1}{x^2+8x+2}\right)dx$
$-b^2=4b-20$
$y'+y\cos x=4\cos x$
$\lim_{x\to\frac{\pi}{2}}\left(3secx-2tanx\right)$
$\lim_{h\to-1}\left(\frac{h^2+7h+6}{h+1}\right)$
$\left(sen\:x\:+\:cos\:x\right)^2$
$\left(-5x\right)\cdot\left(3x-2\right)$
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