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Q.

C is the midpoint of the line joining two points A, B on the ground. A tower at C slightly leans towards B.    If the angles of elevation of the top of the tower from A and B are, 30° and 60° respectively, the angle made by the tower with the horizontal is

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a

450

b

600

c

750

d

300

answer is B.

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m+ncotθ=mcotA−ncotB⇒x+xcotθ=xcot300−xcot600⇒θ=600
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