Homework Help: trigonometry

Posted by rob on Thursday, March 3, 2011 at 12:30am.

if the three sides of a triangle is 4,5,6 then the cosine of the angle between the sides 4 and 5 is

trigonometry - agrin04, Thursday, March 3, 2011 at 5:28am
cos ¤ = (4^2 + 5^2 - 6^2)/(2*4*5)

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