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If vecP + vecQ = vecR and vecP - vecQ =...

If `vecP + vecQ = vecR` and `vecP - vecQ = vecS` , then `R^(2) + S^(2)` is equal to

A

`P^(2)+Q^(2)`

B

`2(P^(2)-A^(2))`

C

`2(P^(2)+Q^(2))`

D

`4PQ`

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The correct Answer is:
C
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