1.

Solution of the differential equation ( frac{dy}{dx} ) + y cot x = cos x is ______

A. (y cos ,x = frac{sin^2 x}{2} + c )
B. (y sin ,x = frac{sin^2 x}{2} + c )
C. (y sin ,x = frac{cos^2 x}{4} + c )
D. (y cos ,x = - frac{sin^2 x}{4} + c )
Answer» C. (y sin ,x = frac{cos^2 x}{4} + c )


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