The function with period 2 is () A. y=2cos2πx-1B. y=sin2πx+cosπxC. y=tan（π2x+π3）D. y=sinπxcosπx

A: Y = 2cos2 π X-1, i.e. y = Cos2 π x, so the period is 2 π 2 π = 1, excluding A. B: y = sin2 π x + cos π x, ∵ y = sin2 π x, period is 1, y = cos π x, period is 2, so excluding B. C: y = Tan (π 2x + π 3), t = π π 2 & nbsp; = 2, C is correct. D: y = sin π xcos π x, i.e. y = 12sin

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