1.

From the top of a building 21 m high, the angle of elevation and depression of the top and the foot of another buillding are 30∘ and 45∘ respectively. The height of the second building is

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From the top of a building 21 m high, the angle of elevation and depression of the top and the foot of another buillding are 30∘ and 45∘ respectively. The height of the second building is



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