IF barP + barQ = barR and P=Q = (R )...

IF ` barP + barQ = barR and P=Q = (R )/(sqrt(2))` then find the angles between the pairs of vectors `( barP , barQ ) , ( barQ,barR) and ( barR, barP)` respectively

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The correct Answer is:

`90^(@),45^(@),45^(@)`

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