1.

If the line segment joining the points p(x1,y1) and Q(x2,y2)subtends and angle α at the origin O,prove that:OP.OQ cos α=x1 x2+y1 y2.

Answer»

If the line segment joining the points p(x1,y1) and Q(x2,y2)subtends and angle α at the origin O,prove that:OP.OQ cos α=x1 x2+y1 y2.



Discussion

No Comment Found