$\frac{d}{dx}\frac{3x+6}{x-2}$
$5x\:+15x^2$
$\lim_{x\to0}\left(\frac{\left(2sin\left(9x^8\right)\right)}{-5x}\right)$
$\left(x^2\right)\cdot\left(x+3\right)\cdot\left(-8\right)$
$2cot2x=4$
$\int6xy^2dy$
$sin^2x-3\:cos^2x=sin^2x-3\left(1-sin^2x\right)$
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