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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|=3,\ | vec b|=5` and `| vec c|=7` , show that the angle between ` vec a` and ` vec b` is `60^0` .

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XII BOARDS PREVIOUS YEAR-BOARD PAPER SOLUTIONS-All Questions
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