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Mathematics 28 Online
OpenStudy (anonymous):

Evaluate cos(31pi/3) I need help solving this, my notes suck.

OpenStudy (anonymous):

try this way: 31 pi /3 = 30 pi/3 + 1pi/3 = 10pi +1pi/3=5*2pi +1pi/3. and some more steps to get the answer. hope you can continue

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