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Two vectors vecA and vecB have equal ma...

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

A

`sin^(-1)(3/5)`

B

`sin^(-1)(1/3)`

C

`cos^(-1)(3/5)`

D

`cos^(-1)(1/3)`

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