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If the line segment joining the points A...

If the line segment joining the points A(a,b) and B(c,d) subtends an angle `theta` at the origin, then `costheta` is equal to

A

`(ab+cd)/(sqrt((a^2+b^2)(c^2+d^2)))`

B

`(ac+bd)/(sqrt((a^2+b^2)(c^2+d^2)))`

C

`(ac-bd)/(sqrt((a^2+b^2)(c^2+d^2)))`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
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