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The solution of differential equation y'...

The solution of differential equation `y'=cos(x+y)` is :

A

`tan((x+y)/(2))=x+c`

B

`tan((x+y)/(2))=-x+c`

C

`tan((x+y)/(2))=2x+c`

D

`tan((x+y)/(2))=-2x+c`

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The correct Answer is:
A
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