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If $\large \overrightarrow P + \overrightarrow Q = \overrightarrow R$ and $\large \overrightarrow P - \overrightarrow Q = \overrightarrow S$ , then R² + S² is equal to

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P2 + Q2

2(P2 - Q2)

2(P2 + Q2)

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Correct option is C

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If and , then R2 + S2 is equal to

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If $\large \overrightarrow P + \overrightarrow Q = \overrightarrow R$ and $\large \overrightarrow P - \overrightarrow Q = \overrightarrow S$ , then R² + S² is equal to