$\lim_{x\to0}\left(\frac{\cos\left(4x\right)-\cos\left(2x\right)}{x^2}\right)$
$46\:.\:-46\:.\:46$
$\lim_{x\to0}\left(\frac{e^{2x}-1}{cos\left(3x\right)+\ln\left(x+1\right)-1}\right)$
$-2630+50$
$-13\left(1^2\right)\left(-1^3\right)+13\left(1^3\right)\left(-1^2\right)$
$12x^2-15x-18\ge0$
$\frac{dy}{dx}=2ye^{3y}+x\left(3y+2\right)$
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