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The angles between the two vectors vecA=...

The angles between the two vectors `vecA=3hati+4hatj+5hatk` and `vecB=3hati+4hatj-5hatk` will be

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`vecA=3hati+4hatj+5hatk, vecB=3hati+4hatj-5hatk`
`vecA.vecB=(3hati+4hatj+5hatk).(3hati+4hatj-5hatk)`
`|vecA||vecB|cos theta =9+16-25=0`
`|vecA|!=0, |vecB|!=0` hence `cos theta =0impliestheta 90^(@)`
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