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trignometry proving identities

Name: Anonymous 2009-08-20 6:25

high school math time!

cos20'cos40'cos80'=1/8
' = degrees
prove

Name: Anonymous 2009-08-20 15:20

do your own homework

Name: Anonymous 2009-08-20 18:28

http://www.wolframalpha.com/input/?i=cos(20)*cos(40)*cos(80)

wolfram says it's true and that's proof enough for me!!
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