g(x)=f(x-π/4)+1
g(3π/4)=1+√2/2 ->sin(w*π/2+π/4)+1=1+√2/2
则 w*π/2+π/4=2kπ+π/4 或w*π/2+π/4=2kπ+3π/4
故w=4k 或w=4k+1
g(5π/4)-1=f(π)
当w=4k时 g(5π/4)-1=f(π)=√2/2
当w=4k+1时 g(5π/4)-1=f(π)=-√2/2