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Question

From the top of a house,h meters high from the ground, the elevation and depression of the top and bottom of a tower on the other side of the street are θ and ϕ respectively. Prove that the height of the tower is h(1+tanθcotϕ)

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Solution

tanθ=(lhd)(1)andtanϕ=(hd)(2)divide(1)by(2)tanθcotϕ=(lhh)orhtanθcotϕ=lhh(1+tanθcotϕ)=l


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