OpenStax, Precalculus 2e §7.6 Modeling with Trigonometric Functions · Exercise 135 · Trigonometry · Identities
Modeling with Trigonometric Functions · Exercise 135
Prove the identity.
A woman is standing 300 feet away from a 2000-foot building. If she looks to the top of the building, at what angle above horizontal is she looking? A bored worker looks down at her from the 15^th floor (1500 feet above her). At what angle is he looking down at her? Round to the nearest tenth of a degree.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Precalculus 2e · §7.6 Modeling with Trigonometric Functions · Exercise 135
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