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Mathematics 18 Online
OpenStudy (anonymous):

tan 9pi/4 Show graph and what it is equal to. For ex: Cos 420 degrees= cos 420+60 Cos 60 degrees= 1/2

OpenStudy (campbell_st):

well if you know \[\pi = 180\] then you can work it out from there... the angle is 1st quadrant

OpenStudy (clalgee):

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