Trig exact values

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ChaoticLlama

Junior Member
Joined
Dec 11, 2004
Messages
199
This was a question that someone gave to me and it's been bugging me for a while

what is the exact value of
sin((3pi)/8)
 
ChaoticLlama said:
sin((3pi)/8)
Click to expand...
sin(3pi/8) = sin((3pi/4)/2) = sqrt((1/2)*(1-cos(3pi/4)))

Are we getting closer?

You have to worry about the signs. What quadrant are we in at 3pi/8?
 
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