$\lim_{x\to0}\left(\frac{e^{2x}}{cosx-\left(x+1\right)}\right)$
$3x^2+2xy+3y^2+\left(x^2+6xy\right)\frac{dy}{dx}=0$
$\sqrt{4x-3}=3$
$\left(-7\right)\cdot\left(-6\right)+16$
$\int\frac{\sqrt{x}+3x^4}{2x^2}dx$
$\left(-10\right)\left(+3\right)\left(-5\right)$
$\int\frac{7x+7}{x^2-4x-21}dx$
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