JEE Physics Practice Question
Which of the following relations is true for two unit vector $$\widehat A$$ and $$\widehat B$$ making an angle $$\theta$$ to each other?
- A.$$|\widehat A + \widehat B| = |\widehat A - \widehat B|\tan {\theta \over 2}$$
- B.$$|\widehat A - \widehat B| = |\widehat A + \widehat B|\tan {\theta \over 2}$$
- C.$$|\widehat A + \widehat B| = |\widehat A - \widehat B|cos{\theta \over 2}$$
- D.$$|\widehat A - \widehat B| = |\widehat A + \widehat B|\cos {\theta \over 2}$$
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