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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. |
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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. |
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