The vector sum of two force \( P \) and \( Q \) is minimum when the...

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The vector sum of two force \( P \) and \( Q \) is minimum when the angle \( \theta \) between their positive directions, is
(A) \( \pi / 4 \)
(B) \( \pi / 3 \)
(C) \( \pi / 2 \)
(D) \( \pi \).
P
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I too used the same concept but got wrong answer

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