What is the integrating factor μ(x)\mu(x)μ(x) for the differential equation dydx+y2=e3x\frac{dy}{dx} + \frac{y}{2} = e^{3x}dxdy+2y=e3x?
μ(x)=ex/2\mu(x) = e^{x/2}μ(x)=ex/2
μ(x)=e2x\mu(x) = e^{2x}μ(x)=e2x
μ(x)=x/2\mu(x) = x/2μ(x)=x/2
μ(x)=e−x/2\mu(x) = e^{-x/2}μ(x)=e−x/2