$\frac{2}{x+3}-\frac{2}{a+3}$
$+12-11-\left(-5\right)-13-7$
$-x;\:x=\:-7$
$\frac{dy}{dx}=-2asin2x+2bcos2x$
$ax-ay-az-5ax-7ay-6az4ax+9ay+8az$
$\int x^2\cdot ln\sqrt{x}dx$
$\int_1^{\infty}\left(\frac{\arctan\left(x\right)}{x^2}\right)dx$
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