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At what angl must the two forces (x+y) a...

At what angl must the two forces `(x+y)` and (x-y) act so that the resultant may be `sqrt(x^(2) + y^(2))` ?

A

`cos^(-1)[-(x^(2)+y^(2))/(2(x^(2) - y^(2)))]`

B

`cos^(-1)[-(2(x^(2)+y^(2)))/(x^(2) - y^(2))]`

C

`cos^(-1)[-((x^(2)+y^(2)))/((x^(2) - y^(2)))]`

D

`cos^(-1)[-((x^(2)-y^(2)))/((x^(2) + y^(2)))]`

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The correct Answer is:
A
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