Posted by diego sanchez on Wednesday, November 21, 2012 at 12:37am.
cos(3x- /2) = sin(3x)
(Check your trig identities)
3x = sin^-1(-3/2)
= 4 pi/3, 5 pi/3, 10 pi/3, 11 pi/3 etc
x = 4 pi/9 etc
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