This is part 5 of an ongoing trigonometry series (links below for previous videos). In this video we will talk about the relationship between sine and cosine (and why we call it cosine), as well as how to find the sin, cos, and tan of the so-called "special angles" (30, 45, 60).

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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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