设f(x)是定义域为R,最小正周期为3π/2的周期函数,当-π/2

问题描述:

设f(x)是定义域为R,最小正周期为3π/2的周期函数,当-π/2

f(-15π/4)=f(-18π/4 +3π/4)=f[-3•(3π/2)+3π/4]=f(3π/4)=sin3π/4=sin(π-π/4)=sin(π/4)=√2/2