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AT what angle two forces (P +Q) and (P-Q...

AT what angle two forces (P +Q) and (P-Q) act so that resultant is
(i) `sqrt(3 P^2 + Q^2)` (ii) `sqrt(2 (P^2 + Q^2))` (iii) ` sqrt(P^2 + Q^2)` .

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The correct Answer is:
`60^(@)`
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