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If θ is the angle which the straight line joining the points (x1,y1) and (x2,y2) subtends at the origin, prove that tan θ=x2y1−x1y2x1x2+y1y2 and cos θ=x1x2+y1y2√x21+x21√x22+y22 |
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Answer» If θ is the angle which the straight line joining the points (x1,y1) and (x2,y2) subtends at the origin, prove that tan θ=x2y1−x1y2x1x2+y1y2 and cos θ=x1x2+y1y2√x21+x21√x22+y22 |
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