I think this should be sinxdy/dx+(cosx)y=(sinx)^2 if so, divide by sinx The left-hand side = d/dx(sinx)y and the integral of (sinx)^2 is (1/2)x - (1/2)sin(2x) so integrating gives (sinx)y = (1/2)x-(1/4)sin(2x)+C which is the general solution. Your equation as written cannot be solved in common functions.
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