SOLUTION: i want to know all the formulas of cos

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Question 19980: i want to know all the formulas of cos
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
cos = opposite/adjacent
Laws of cos = c%5E2=a%5E2%2Bb%5E2-2abcos%28gamma%29
a%5E2=c%5E2%2Bb%5E2-2cbcos%28alpha%29
b%5E2=c%5E2%2Ba%5E2-2cacos%28beta%29