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

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

A

A. `x_(1)^(2) + x_(2)^(2)`

B

B. `y_(1)^(2) + y_(2)^(2)`

C

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

D

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

Text Solution

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The correct Answer is:
C
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