The only function that doesn't have a period of 2π is; C: y = 2π tan x
Trigonometric curves
The general formula is;
y = A sin (ωx)
Now, we know that ω = 2π/t
Where t is period
Thus;
t = 2π/ω
In options A, B and D ω = 0.5
Thus, their period is 2π but option C has ω = 1
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