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cos (x- pi/3) = akar (3)/2
x- pi/3 = cos^-1 akar(3)/2
x- pi/3 = pi/6 atau x- pi/3 = 11pi/6
jadi
x = pi/6 + 2pi/6 = pi/2
atau
x= 11pi/6 + 2pi/6 = 13pi/6
karena 0x = pi/2 saja