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If a=(x)/(x^(2)+y^(2))and b=(y)/(x^(2)+y...

If `a=(x)/(x^(2)+y^(2))and b=(y)/(x^(2)+y^(2)).` The value of (x+y) is

A

`(ab)/(sqrt(a^(2)+b^(2)))`

B

`((a+b)^(2))/(sqrt(a^(2)+b^(2)))`

C

`(a+b)/(a^(2)+b^(2))`

D

`sqrt(a^(2)+b^(2))`

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