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If vec(a)+vec(b)+vec( c )=0 and |vec(a)|...

If `vec(a)+vec(b)+vec( c )=0` and `|vec(a)|=6,|vec(b)|=5,|vec( c )|=7` then find the angle between the vectors `vec(b)` and `vec( c )`.

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The correct Answer is:
`cos^(-1)(-(19)/(35))`
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