Sinc=sin(x+π/3), C=4√3sin(x+π/3), add, decompose and merge, so f(x)= 12sin(x+π/6)+6, x ∈ (0,2π.
X+π/6 ∈ (π/6,5π/6), SIN (X+π/6) ∈ (1/2, 1), so the range of values is (12,1.
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