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If O is the origin and if A(x(1), y(1)),...

If O is the origin and if `A(x_(1), y_(1)), B(x_(2), y_(2))` are two points then `OA*OB*cos angleAOB=`

A

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

B

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

C

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

D

`x_(1)y_(2)-x_(2)y_(1)`

Text Solution

Verified by Experts

The correct Answer is:
C
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