$4.5ab-2.2ab$
$5^0+4^1+\left(-1\right)^2+\left(-2\right)^3$
$\int\frac{1}{x^2-6x+13}dx$
$\int\:\frac{x^2}{\sqrt{9-25x^2}}dx$
$\frac{2x^2+x-1}{x^2-1}$
$\int secxtanx\sqrt{1+secx}dx$
$\left(\frac{\left(x+2x^2\right)}{\sqrt{x}}\right)$
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