$\int_0^{\frac{\pi}{2}}\left(7\cos\left(6x\right)\cos\left(7x\right)\right)dx$
$-30+18-7+1-5\:-6+-7$
$x^3y^2-14xy+49x$
$\lim_{x\to\infty}\left(\frac{x^4+x^2}{7x^5}\right)$
$\int_{-1}^1e^{-2x}dx$
$\frac{dy}{dx}-\frac{y^2}{x^2}=\frac{2y}{x^2}$
$-5^1$
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