$\frac{d}{dx}\left(sin\left(7x+9y\right)=7x+7y\right)$
$\lim_{x\to-1}\left(x-\sqrt{x^2+3x}\right)$
$\left(5x-3\right)\left(2x+4\right)<0$
$\left(+9\right)\:-\:\left(-16\right)$
$4x^3-6x+3x+2-6$
$\left(\sqrt{x}-6\right)^2$
$\int cos^2\left(\frac{x}{4}\right)dx$
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