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Obtain the angle between A+B and A-B if ...

Obtain the angle between A+B and A-B if `A = 2hati +3hatj and B = hati - 2hatj.`

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The correct Answer is:
A, C, D
`A+B = R = 3hati + hatj`
`A -B = S = hati + 5hatj`
Now, angle between R and S is
`theta = cos^(-1) ((R.S)/(RS))`.
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