$\int\sqrt{20-x^2}\left(-2x\right)\:dx$
$\left(3x^2-2x+1\right)+\left(-x^2+3x+1\right)$
$1-\frac{sen^2x}{cos^2x}+\frac{senx}{cosx}$
$5\left(z-4\right)-z=4z-20$
$\sin\left(a-b\right)$
$\frac{3x^2+5x-4}{x+3}$
$\lim_{x\to1}\:\sqrt{\frac{5x-3}{x+3}}$
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