$\frac{1}{2}\left(x^2+2x+1\right)-4x-4-3-\frac{1}{2}x^2+4x+3$
$f^2-7f-30$
$sen\left(x\:+\:7\:y\right)\:=\:3\:x$
$15^2+6^2$
$\frac{d}{dx}\left(-e^{-\frac{s^2}{8}}\right)$
$36a^2-12a-1$
$\frac{5\:2}{5\:-3}$
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