My Math Forum half angle ..

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 November 13th, 2008, 04:18 PM #1 Senior Member   Joined: Sep 2008 Posts: 199 Thanks: 0 half angle .. show that tan 22.5 = square root 2 -1 thanks for any help ..
 November 13th, 2008, 05:21 PM #2 Senior Member   Joined: Jul 2008 Posts: 895 Thanks: 0 Re: half angle .. Google: Half angle formula.
 November 13th, 2008, 06:12 PM #3 Senior Member   Joined: Oct 2007 From: Chicago Posts: 1,701 Thanks: 3 Re: half angle .. It may help to remember that tan(x) = sin(x)/cos(x)
November 13th, 2008, 06:52 PM   #4
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Re: half angle ..

Quote:
 Originally Posted by cknapp It may help to remember that tan(x) = sin(x)/cos(x)
It might be better to know that tan(x/2) = (1-cos(x))/sin(x) = sin(x)/(1+cos(x)) ...take your pick.

 November 14th, 2008, 01:46 AM #5 Newbie   Joined: Nov 2008 Posts: 3 Thanks: 0 Re: half angle .. wait ..
 November 14th, 2008, 02:18 AM #6 Senior Member   Joined: Sep 2008 Posts: 199 Thanks: 0 Re: half angle .. alright i got it .. thx all

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