If O is the origin and the coordinates of A and B are (x1, y1) and (x2, y2) respectively then OA × OB cos∠AOB is equal to

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x1y1+x2y2

x1x2+y1y2

x1y2+x2y1

x1x2−y1y2

answer is B.

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Detailed Solution

2OA×OBcos⁡AOB=(OA)2+(OB)2−(AB)2

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