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If O be the origin and if P(x1, y1) and ...

If O be the origin and if `P(x_1, y_1) and P_2 (x_2, y_2)` are two points, the `OP_1 (OP_2) COS angle P_1OP_2`, is equal to

A

`x_(1)y_(2)+x_(2)y_(1)`

B

`(x_(1)^(2)+y_(1)^(2))(x_(2)^(2)+y_(2)^(2))`

C

`(x_(1)+x_(2))^(2)+(y_(1)+y_(2))^(2)`

D

`x_(1)x_(2)+y_(1)y_(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
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