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OpenStudy (anonymous):
Determine the sign of sin 5pi/4 Positive Negative
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OpenStudy (anonymous):
ask me if you don't understand. message me.
OpenStudy (anonymous):
can you tell me if its postive or negaative?
OpenStudy (anonymous):
5pi/4 is 225 degrees. So it is in 3rd quadrant. In 3rd quadrant Sin is negative. Answer is negative.
OpenStudy (anonymous):
-1/sqrt(2)
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