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Question

Solve:-sinxdydx+3y=cosx

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Solution

sinxdydx+3y=cosx
dydx3sinx=cotx
I.F.=edxsinx
I.F.=ecosecxdx
cosecxdx=ln|cosecx+cotx|
I.F.=eln|cosecx+cotx|
I.F.=cosecx+cotx
Multiplying the differential equation with I.F.
y(cosecx+cotx)=cotx(cosecx+cotx)dx
y(cosecx+cotx)=(cosecx+cotx+x)
y=(1+xcosecx+cotx)


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