Q 2358334204.     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 angle AOB`?

NDA 2008 Paper 1 April
A

`x_1^2 + x_2^2`

B

`y_1^2 + y_2^2`

C

`x_1y_1 + x_2y_2`

D

`x_1y_1 - x_2y_2`

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