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Two vectors are $( \overrightarrow A + \overrightarrow B)$ and $( \overrightarrow A - \overrightarrow B)$. The angle between their resultant vector and $ \overrightarrow A $ is :

$\begin {array} {1 1} (1)\;\cos^{-1}\:( A/B) & \quad (2)\;\cos^{-1} (B/A) \\ (3)\;\cos^{-1} \bigg( \large\frac{A-B}{A+B} \bigg) & \quad (4)\;Zero \end {array}$

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(4) Zero
answered Nov 7, 2013 by pady_1

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