Math, asked by kiranrao2115, 4 months ago

If a=l1i+m1j+n1k and b=l2i+m2j+n2k are two unit vectors and theta be the angle between them then show that cos theta=l1l2+m1m2+n1n2

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Answered by KimMyeongsyong

1

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my writing is not good but I still hope it helps you

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