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Help with differential equation


Dear experts,
I tried solving  the following differential equation using DSolve:

y' ' [x]+a( y' [x] ) = b( cos[y] )

But I got error message which asked me to provide proper arguments for
cos..
So I changed cos[y] to cos[kx] and obtained solution...
However, I have to solve the equation by keeping cos[y] in order to
obtain a solution of relevance to my work.
Please help.
praveen


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