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December 7th, 2009, 12:18 PM   #1
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i want to explain the solution to this question

i want to explain the solution to this question ..

I worked a red line on the steps that I did not understand
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 December 7th, 2009, 12:40 PM #2 Newbie   Joined: Nov 2009 Posts: 22 Thanks: 0 Re: i want to explain the solution to this question First red must be: cos(3pi/2) Now: cos(3pi/2)=cos(270)=0 sin(3pi/2)=sin(270)= -1 (second red line) Does that make sense?
 December 7th, 2009, 01:41 PM #3 Senior Member   Joined: Oct 2009 Posts: 895 Thanks: 1 Re: i want to explain the solution to this question but why we said 2pi/2 in second step ??
 December 7th, 2009, 02:40 PM #4 Newbie   Joined: Nov 2009 Posts: 22 Thanks: 0 Re: i want to explain the solution to this question Must be a mistake. A typo.
 December 8th, 2009, 06:45 AM #5 Senior Member   Joined: Oct 2009 Posts: 895 Thanks: 1 Re: i want to explain the solution to this question ok who u can know cos(3pi/2)=cos(270[color=#BF0000])=0[/color] sin(3pi/2)=sin(270)= [color=#BF0000]-1 [/color] from where i can get 0 and -1 ? give me a way to finid them
 December 8th, 2009, 08:09 AM #6 Senior Member   Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3 Re: i want to explain the solution to this question Flash tutorial: http://www.dudefree.com/Student_Tool...nit-circle.php
 December 8th, 2009, 08:31 AM #7 Global Moderator     Joined: Nov 2009 From: Northwest Arkansas Posts: 2,767 Thanks: 5 Re: i want to explain the solution to this question

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