$\frac{dy}{dx}=\frac{xy+5y}{x^2}$
$-11\left(7\right)\left(\left(-7\right)\right)$
$\int_1^4\frac{e^y}{x}dx$
$x^2-4x+1=\:0$
$\int\left(15xe^x\right)dx$
$2-2-2+6\left(8-4\right)+2$
$cos4x=2cos^2\left(2x\right)-1$
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