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[" 6.A tower subtends an angle a at "],[...

[" 6.A tower subtends an angle a at "],[" a point A in the place of its base "],[" and the angle of depression of "],[" the foot of the tower at a point b "],[" ft.just above A is "beta" .Prove that "],[" the height of the tower is b tan a "],[" cot "beta" ."]

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