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Two vectors vecA" and "vecB have equal m...

Two vectors `vecA" and "vecB` have equal magnitudes. If magnitude of `vecA+vecB` is equal to n times the magnitude of `vecA-vecB`, then the angle between `vecA" and "vecB` is :-

A

`cos^(-1)((n-1)/(n+1))`

B

`cos^(-1)((n^(2)-1)/(n^(2)+1))`

C

`sin^(-1)((n-1)/(n+1))`

D

`sin^(-1)((n^(2)-1)/(n^(3)+1))`

Text Solution

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The correct Answer is:
B
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