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OpenStudy (anonymous):
how to get cos(-3pie/4)
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OpenStudy (luigi0210):
Uhm, you get it by going 135 degrees clockwise on the unit circle?
OpenStudy (anonymous):
is there another way?
OpenStudy (anonymous):
|dw:1370971840411:dw| \[\cos -3\pi/4 = -\sqrt{2}/2\]
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