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Questions  

 The solution of the differential equation dydx=sin(x+y)tan(x+y)1 is 

a
cosec(x+y)+tan(x+y)=x+c
b
x+cosec(x+y)=c
c
x+tan(x+y)=c
d
x+sec(x+y)=c

detailed solution

Correct option is B

Put x+y=t→1+dydx=dtdx⇒∫cosectcott⁡dt=∫dx⇒-cosec⁡(x+y)+c=x

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