Math, asked by THAKUR1PRASHANT, 8 months ago

if O is the origin anf if coordinates of ant two points Q1 and Q2 are (x1,y1) and (x2,y2), respectively, Prove that OQ1.OQ2 COS angle Q1OQ2 = x1x2+y1y2 PLEASE HELP IT IS FROM CENGAGE ILLUSTRATON 1.4

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Answered by khadijah80

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Answer:

didn't get it. can you please repeat the question..

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