Question

把函数f(x)=2cos(2x+α）+1（0

Answer 1

f(x+π/3)=2cos(2(x+π/3)+α）+1=2cos(2x+2π/3+α)+1

2cos(2*π/6+2π/3+α)+1 = 1

2cos(π+α)=0

cos(π+α)=cosα=0

0