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If vec P+ vec Q = vec R and |vec P| = |v...

If `vec P+ vec Q = vec R` and `|vec P| = |vec Q| = | vec R|`, then angle between `vec P` and `vec Q` is

A

`30^circ`

B

`60^circ`

C

`90^circ`

D

`120^circ`

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