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December 7th, 2009, 12:18 PM  #1 
Senior Member Joined: Oct 2009 Posts: 895 Thanks: 1  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 
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 
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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