下列函数中最小正周期不为π的是 A f(x)=sinxcosx B g(x)=tan(x+π/2) C(x)sin^2x-cos^2x

问题描述:

下列函数中最小正周期不为π的是 A f(x)=sinxcosx B g(x)=tan(x+π/2) C(x)sin^2x-cos^2x
D f(x)=sinx+cosx

D麻烦写下过程A=sinxcosx =1/2SIN2X,T=2π/2=πB=同上T=2π/2=πC=是(sinx)^2-(cosx)^2吧,老大,注意歧义啊,=1-2(cosx)^2=cos2x T=2π/2=πD=f(x)=sinx+cosx=根号2*sin(x+45度)T=2π/1=2π