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OpenStudy (anonymous):
cos (2pi/9) cos (pi/9) - sin (2pi/9) sin(pi/9)
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OpenStudy (aum):
cos(A)cos(B) - sin(A)sin(B) = cos(A+B) Here, A = 2pi/9 and B = pi/9
OpenStudy (cwrw238):
so now you need to simplify 2pi/9 + pi/9 what does that come to?
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