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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