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The coordinates of the points O,A and B ...

The coordinates of the points O,A and B are (0,0),(x,y) and (y,x) respectively . If `angleAOB=theta`, then find the value of `costheta` .

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The correct Answer is:
`=(4xy)/(2(x^(2)+y^(2)))=(2xy)/(x^(2)+y^(2))`
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