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Mathematics 11 Online
OpenStudy (anonymous):

Evaluate a) sin (4pi/3) b) cos (5pi/6)

OpenStudy (cwrw238):

4pi/3 is in 3rd quadrant where sine is negative find value of sin pi/3 on your calculator and make it negative

OpenStudy (cwrw238):

b) 5pi/6 is in 2nd quadrant where cos is negative find cos pi/6 and make it negative |dw:1353457013167:dw|

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