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from a window 30 feet above the street, the angle of elevation to the top of the building across the street is 50.0 degrees and the sngle of...

from a window 30 feet above the street, the angle of elevation to the top of the building across the street is 50.0 degrees and the sngle of depression to the base of this building is 20.0 degrees. Find the height of the building across the street.

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