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2014-07-29T09:03:06+05:30

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After the first cos x  + ,  the remaining is also equal to y.
So  y  =  √(cos x  + y)            square both sides.
then  y² = cosx + y
differentiate : 
 2 y dy/dx  =  - sin x + dy/dx
Rearrange both sides answer follows.


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