(Solved): 4. The integrating factor for the linear differential equation \( y^{\prime}-2 x y=\cos \left(x^{3 ...

4. The integrating factor for the linear differential equation \( y^{\prime}-2 x y=\cos \left(x^{3}\right) \) is \( \mathbf{2 . 3 6} \) modified in an inconsequential way 2017 (A) \( -2 x+C \) (B) \( x^{2} \) (C) \( e^{-2 x} \) (D) \( -2 x \) (E) \( e^{-x^{2}} \)