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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
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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?
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December 7th, 2009, 01:41 PM   #3
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Re: i want to explain the solution to this question

but why we said 2pi/2 in second step ??
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December 7th, 2009, 02:40 PM   #4
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Re: i want to explain the solution to this question

Must be a mistake.
A typo.
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December 8th, 2009, 06:45 AM   #5
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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
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December 8th, 2009, 08:09 AM   #6
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Re: i want to explain the solution to this question

Flash tutorial: http://www.dudefree.com/Student_Tool...nit-circle.php

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December 8th, 2009, 08:31 AM   #7
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Re: i want to explain the solution to this question

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