Q.
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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a
x1y1+x2y2
b
x1x2+y1y2
c
x1y2+x2y1
d
x1x2−y1y2
answer is B.
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Detailed Solution
2OA×OBcosAOB=(OA)2+(OB)2−(AB)2
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