$\int\frac{1}{x\sqrt{9+x^2}}\:dx$
$10a+8b-4+2a+3b-16$
$\left(2x\:+\:1\right)\left(2x-5\right)$
$\frac{dy}{dx}=2y-2x-1$
$\frac{d^2}{dx^2}\left(8x^4+7x^3\right)$
$\int\left(\sqrt[2]{64-x^2}\right)dx$
$\left(40-0.7k\right)^2$
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