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Two vectors vec A and vec B have equal ...

Two vectors ` vec A` and `vec B` have equal magnitudes . If magntiude of ` vec A+vec B` is equal to (n) times the magnitude of ` vec A-vec B`, then angle between ` vec A` and ` vec B` is .

A

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

B

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

C

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

D

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

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