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If O is the origin and the coordinates of A and B are $(x_{1}, y_{1})$ and $(x_{2}, y_{2})$ respectively then $O A \times O B \cos ∠ A O B$ is equal to

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detailed solution

Correct option is B

2OA×OBcos⁡AOB=(OA)2+(OB)2−(AB)2

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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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If O is the origin and the coordinates of A and B are $(x_{1}, y_{1})$ and $(x_{2}, y_{2})$ respectively then $O A \times O B \cos ∠ A O B$ is equal to