If bar(a) = 6bar(i) + 2bar(j) + 3bar(k) ...

If `bar(a) = 6bar(i) + 2bar(j) + 3bar(k) and bar(b) = 2bar(i) - 9bar(j) + 6bar(k)`, then find `bar(a).bar(b)` amd the angle between `bar(a) and bar(b)`.

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The correct Answer is:

`theta = Cos^(-1)((12)/(77))`

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