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If vecA 2 hati +hatj -hatk, vecB=hati +2...

If `vecA 2 hati +hatj -hatk, vecB=hati +2hatj +3hatk, vecC=6hati -2hatj-6hatk` angle between `(vecA+vecB) and vecC` will be

A

`30^(@)`

B

`45^(@)`

C

`60^(@)`

D

`90^(@)`

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The correct Answer is:
D
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