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Precalculus

Trigonometric Functions

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1
Angles and Their Measure

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2
Trigonometric Functions Using the Unit Circle

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3
Right Triangle Trigonometry

Problem 8

An observer meansures an angle of elevation of 41 \(^{\circ}\) to the top of a lighthouse from a certain point on the ground. She then walks 15 feet closer to the lighthouse and measures an angle of elevaion of 44\(^{\circ}\). See Figure 15. How tall is the lighthouse? Round your answer to two decimal places.

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