$\lim_{h\to0}\left(\frac{\frac{1}{m+h}-\frac{1}{m}}{h}\right)$
$\frac{d}{dx}x\:arc\:cos\:4x^2$
$\int_0^3\:\frac{3}{\sqrt{144-9x^2}}dx$
$3x-5y+7z+5z-8x+y$
$x^2-100x+2100$
$-x-1x-1$
$\frac{dx}{dt}=x=\left(\frac{x}{t}\right)$
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