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

At what angle 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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