math
posted by diego sanchez .
find all the values of X between 0 and 2π such that cos(3xπ/2) = √3/2

cos(3x ƒÎ/2) = sin(3x)
(Check your trig identities)
3x = sin^1(ã3/2)
= 4 pi/3, 5 pi/3, 10 pi/3, 11 pi/3 etc
x = 4 pi/9 etc
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