$\frac{\left(\cos\left(7x\right)-\cos\left(3x\right)\right)}{\sin\left(7x\right)-\sin\left(3x\right)}$
$-630:-18$
$-\frac{6}{3}$
$\frac{d}{dx}\left(x^2y+y=xy^2+x\right)$
$\int_2^5\left(x-2\right)e^xdx$
$\frac{d}{dx}e^{\frac{1}{x}}$
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