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Linear differental equation of the form ...

Linear differental equation of the form `dx/dy + Px = Q` where P, Q are functions of y or costants and the coefficient of `dx/dy = 1`. Taking `e^(int P dy)` as Integrating factor the above form reduces to `d/dy(xe^(int Pdy))= Qe ^(intPdy).`
Solution of the equation `dx + xdy = e^(-y) sec^(2) ydy` is-

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The correct Answer is:
`xe^(y) = tan y+c`
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