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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)))`

Text Solution

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The correct Answer is:
A
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