This video will take the basics we've learned about sin, cos, and tan, and apply them to a slightly more complicated picture. The pictures in these problems contain multiple triangles. The reason I call them "Double Triangle" problems is because they all boil down to working with a pair of triangles in order to solve the problem.

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If you need a refresher on earlier Trig topics, check out:

Trigonometry Pt 1: Basic Trig Introduction:    • Trigonometry Pt. 1 - Sin, Cos, Tan  
Trigonometry Pt 2: Inverse Trig Introduction:    • Trigonometry Pt 2 - Inverse Trig  
Trigonometry Pt 3: Angles of Elevation/Depressions:    • Trigonometry Pt 3 - Angles of Elevati...  
Trigonometry Pt 4: Double triangle trig:    • Trigonometry Pt 2 - Inverse Trig  
Trigonometry Pt 5: Law of Sines:    • Trigonometry Pt 5 - Law of Sines  


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