help Trig equation

Jomo

Elite Member
Joined
Dec 30, 2014
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10,718
pi + pi/6 = pi(1+ 1/6) = pi(7/6) = 7pi/6
cos(-u) = cos(u) for any value u. That is, cos is an even function
2pi - pi/4 = 7pi/4
 
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