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If a tower subtends angles theta, 2 thet...

If a tower subtends angles `theta, 2 theta and 3 theta` at three points A,B,and C respectively, lying on the same side of a horizontal line through the foot of the tower, show that `(AB)/(BC) (cot theta- cot 2 theta)/(cot 2 theta - cot 3 theta).`

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