Let vec(a) and vec(b) be two given vecto...

Let `vec(a)` and `vec(b)` be two given vectors such that `|vec(a)|=3, |vec(b)|=4` and the angle between them is `60^(@)`. Find `vec(a).vec(b)`.

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The correct Answer is:

Clearly, we have
`vec(a).vec(b)=|vec(a)||vec(b)| cos 60^(@)=(3xx4xx1/2) =6`.

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