下列函数中周期为π/2的是A.y=sinx/2 B.y=sin2xC.y=cosx/4 D.y=cos4x请利用周期公式写出求法:______________________________________________________________________________________________________________________________________________
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![下列函数中周期为π/2的是A.y=sinx/2 B.y=sin2xC.y=cosx/4 D.y=cos4x请利用周期公式写出求法:______________________________________________________________________________________________________________________________________________](/uploads/image/z/13554565-61-5.jpg?t=%E4%B8%8B%E5%88%97%E5%87%BD%E6%95%B0%E4%B8%AD%E5%91%A8%E6%9C%9F%E4%B8%BA%CF%80%2F2%E7%9A%84%E6%98%AFA.y%3Dsinx%2F2+B.y%3Dsin2xC.y%3Dcosx%2F4+D.y%3Dcos4x%E8%AF%B7%E5%88%A9%E7%94%A8%E5%91%A8%E6%9C%9F%E5%85%AC%E5%BC%8F%E5%86%99%E5%87%BA%E6%B1%82%E6%B3%95%3A______________________________________________________________________________________________________________________________________________)
下列函数中周期为π/2的是A.y=sinx/2 B.y=sin2xC.y=cosx/4 D.y=cos4x请利用周期公式写出求法:______________________________________________________________________________________________________________________________________________
下列函数中周期为π/2的是
A.y=sinx/2 B.y=sin2x
C.y=cosx/4 D.y=cos4x
请利用周期公式写出求法:___________________________________________________________________________________________________________________________________________________________________________________________.
下列函数中周期为π/2的是A.y=sinx/2 B.y=sin2xC.y=cosx/4 D.y=cos4x请利用周期公式写出求法:______________________________________________________________________________________________________________________________________________
答案为D
A sin(x/2+2π)= sin((x+4π)/2) 周期为4π
B 同理 周期为π
C 同理 周期为8π
D 同理 周期为π/2
周期T=2π/w
T=π/2=2π/w
W=4
D.y=cos4x