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When you get into the more challenging triangles where not all three sides are given we use the following trigonometry rules.
Sin X = opposite / hypotenuse Csc X = hypotenuse / opposite
Cos X = adjacent / hypotenuse Sec X = hypotenuse / adjacent
Tan X = opposite / adjacent Cot X = adjacent / opposite
Csc X = 1 / sin X
Sec X = 1 / cos X
Cot X = 1 / tan X
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