$\left(1-cos\left(x\right)\right)\frac{dy}{dx}+\left(2sen\left(x\right)\right)y=tanx$
$-\frac{1}{2}e^{-2x}sin\left(x\right)cos\left(x\right)-\frac{1}{4}e^{-2x}cos\left(2x\right)$
$x+\left(-186\right)=205$
$\left(3x-9\right)\cdot\left(x-3\right)$
$4x^2+12x=10$
$cot\left(x\right)=1$
$x^2\frac{dy}{dx}=x^2+xy+y^2$
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