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From the top of a lighthouse 75 feet high, the cosine of the angle of depression of a boat out
at sea is 4. To the nearest foot, how far is the boat from the base of the lighthouse?
14 years ago

Answers

Henry
The cosine can't be greater than 1.
14 years ago
Henry
cosA = 0.4,
A = 66.4 deg.

tan66.4 = 75 / d,
d = 75 / tan66.4 = 33 Ft.
14 years ago

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