1.

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

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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