It's the sine! No, it's the tangent! No, it's the cosine! Alright, so maybe evaluating trigonometric functions isn't as exciting as spotting Superman in the sky. But we bet you jump for joy the first time you solve for cosine.

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SOHCAHTOA 
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Sines 
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Law of Sines 
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Law of Cosines 
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Cosines 
Up Next:
Verifying Trig Identities 
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Tangent HalfAngle Formula 
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Special Right Triangles