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OpenStudy (anonymous):
HELPPPPPP! Find the exact value of sin 7pi/4
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OpenStudy (nathan917):
sin(7pi/4) = sin(2pi -- pi/4) = sin(-pi/4) = -sin(pi/4) = - sqrt(2)/2
OpenStudy (anonymous):
If you take a look at the unit circle I attached, it will help you with future problems as well. I circled sin (7pi/4)
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