$\frac{2x}{xy}$
$\frac{dy}{dx}=-\frac{1}{3}\left(m-2\right)$
$9x^2-25<0$
$\frac{\left(1-sec^2\left(3x\right)\right)}{\left(6x\right)^2}$
$\lim_{x\to0}\left(\frac{2-\left(1+x\right)^x}{1-x}\right)$
$sinx\:\left(1-2cos^{2\:}x+cos^4x\right)$
$38-\left(-4\right)$
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