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Three vectors vec(P), vec(Q), vec(R) obe...

Three vectors `vec(P), vec(Q), vec(R)` obey `vec(P) + vec(Q) = vec(R)` and `P^(2) + Q^(2) = R^(2)` the angle between `vec(P)` & `vec(Q)` is

A

`0^(@)`

B

`30^(@)`

C

`60^(@)`

D

`90^(@)`

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The correct Answer is:
D
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