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The coordinates of O , A and B are (0,0)...

The coordinates of O , A and B are `(0,0) , (x,y) and (y,x)` respectively. If `angle AOB=theta, `then the value of `cos theta ` is-

A

`(xy)/(x ^(2) +y^(2))`

B

`(x^(2) -y^(2))/(x^(2)+y^(2))`

C

`(4xy)/(x ^(2) +y^(2))`

D

`(2xy)/(x ^(2) + y^(2))`

Text Solution

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The correct Answer is:
D
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