$\left(x+\frac{2}{3}y\right)^2$
$\left(5x^2+2x-3\right)+\left(7-3x+4x^2\right)$
$2x^2-20x+5=3$
$\lim_{x\to\infty}\left(\frac{cos\left(x\right)}{sen\left(-4\pi+8x\right)}\right)$
$\frac{ds}{dt}=\frac{1}{t}$
$13^2+56^2$
$\int\frac{x^2}{x-7}dx$
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