$\lim_{x\to0}\left(\frac{e^{x\cos\left(x\right)}-1-x}{\sin\left(x^2\right)}\right)$
$\frac{3x^2-5}{12x}$
$1084-2312$
$\left(20\cdot x\right)^2$
$30-1$
$\lim_{x\to4}\left(\frac{x^2+x-20}{x-4}\right)$
$-5\frac{dy}{dx}+3\cdot2^x=0$
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