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## Homework Statement

A Missile rises vertically from a point on the ground 75,000 feet from a radar station. If the missle is rising at the rate of 16,500 feet per minute at the instant when it is 38,000 feet high. What is the rate of change, in radians per minute, of the missile's angle of elevation from the radar station at this instant?

A) 0.175

B) 0.219

C) 0.227

D) 0.469

E) 0.507

## The Attempt at a Solution

Here's my attempted drawing:

http://carlodm.com/calc/PIC.JPG [Broken]

I'm thinking of using cosine.... but what good does this do me? I'm so lost. Can I get hints please?

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