Fill in the blanks
(a) The general solution of the equation is ______ dy/dx + y/x = 1
(b) Integrating factor of xdy/dx – y = sin x is ______
(c) The differential equation of y = A sin x + B cos x is _______
(d) The D.E is a dy/dx + y/xlogx = 1/x ________ differential equation.