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Find the angle between the vectors veca ...

Find the angle between the vectors `veca` and `vecb`
if `|veca|=2|vecb|=3" and " veca.vecb=1`
if `veca=hati+hatj+hatk` and `vecb=hati-hatj-hatk`.

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(i) `cos^(-1)((1)/(6))`
(ii) `cos^(-1)((-1)/(3))`
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