At what angle must the two forces (x+y) and (x-y) act so that the resultant may be √((x^2+y^2)) (...

At what angle must the two forces (x+y) and (x-y) act so that the resultant may be √((x^2+y^2))
(1)
(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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