$2.9\cos19$
$-\sqrt{28}-6\sqrt{7}$
$\left(2800\right)\left(0.02\right)\left(4\right)$
$\lim_{x\to0}\left(\frac{2^x-1}{x^2-x}\right)$
$\frac{dy}{dx}\cdot x=\left(y+\left(\frac{x}{tan\left(\frac{y}{x}\right)}\right)\right)$
$-8x^2-64x-123$
$\sqrt{126.75}$
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