Sine is the opposite over the hypotenuse; cosine is the adjacent over the hypotenuse; and tangent is the opposite side over the adjacent side. Aha, now you see why there's an abbreviation.

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Sines 
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Cosines 
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Law of Sines 
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Law of Cosines 
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Vertical Angle Theorem 
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Triangle Inequality Theorem 
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306090 Triangle 
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Triangles