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)))]`

At what angle must the two forces `(x+y)` and `(x-y)` act so that the

1.	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)))]`
Answer» Correct Answer - A

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