$\frac{4cos\left(2x\right)}{\sqrt{4cos^2\left(2x\right)+4sin^2\left(2x\right)+1}}$
$16x^2+56x$
$\int\frac{5x-2}{x^2-9x+20}dx$
$3a+1;\:a=2$
$\lim_{x\to1}\:\sqrt{\frac{5x-3}{x+3}}$
$e^{-\infty^2}$
$\left(4ab2+6xv3\right)^2$
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