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The solution of cos(x + y) dy = dx is...

The solution of `cos(x + y) dy = dx` is

A

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

B

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

C

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

D

(d) `cot ((x+y)/2)=x+c`

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The correct Answer is:
A
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