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Consider two vectors oversetrarra "and" oversetrarrbso that|oversetrarra|=2,|oversetrarrb|=5 "and"|oversetrarraxxoversetrarrb|=8. Suppose the angle between a and b is acute.Prove that oversetrarra.oversetrarrb=6 |
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Answer» Solution :`veca.vecb =|veca||vecb| cos THETA` `2xx5xx SQRT(1-sin^2 theta)` `=10 sqrt(1-(16)/(25))=10xx3/5=6` |
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