The magnitudes of vectors vecA,vecB and ...

The magnitudes of vectors `vecA,vecB and vecC` are 3,4 and 5 units respectively. If `vecA+vecB= vecC`, the angle between `vecA` and vecB` is

`(pi)/2`

`cos^(-1)(0.6)`

`tan^(-1)(7/5)`

`(pi)/4`

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