$\lim_{x\to1}\left(\frac{x^2-1+\frac{1}{x}}{e^2}\right)$
$209^2$
$\cos\left(2x\right)+3\cos\left(x\right)=-1$
$\:\int\:e^4x\:sen\:5x\:dx$
$\left(4u+1\right)\left(5\right)$
$\frac{1}{25}+\frac{25x^2}{36}-\frac{x}{3}$
$0.333333+0-\left(\frac{-3}{-2}\right)$
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