$\lim_{x\to0}\left(\frac{\tan\left(2x\right)-\sin\left(2x\right)}{x}\right)$
$7y^2-2y-5$
$8xy\:-\:2xz\:-\:2yz$
$y+y'=2e^x$
$\left(\frac{7.5^2-11^2-5^2}{-2\left(7.5\right)\left(5\right)}\right)$
$\frac{dy}{dx}=-\frac{y}{4}$
$\frac{x^3-2x^2+3x+2}{x+2}$
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