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The angle of elevation of the top of a chimney from the top of a tower is `60o` and t he angle of depression of the foot of the chimney from the top of the tower is `30o` . If the height of the tower is 40 m, find the height of the chimney. According to pollution control norms, the minimum height of a smoke emitting chimney should be 100 m. State if the height of the above mentioned chimney meets the pollution norms. What value is discussed in this question?

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