Q. 54.4( 5 Votes )
If θ is the angle which the straight line joining the points (x1, y1) and (x2, y2) subtends at the origin, prove that and .
A (x1, y1) and B (x2, y2) be the given points and O be the origin.
Slope of OA = m1 = y1x1
Slope of OB = m2 = y2x2
It is given that θ is the angle between lines OA and OB.
As we know that
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