你好：y=cosx+sinx+1 =√2（√2/2cosx+√2/2sinx)+1 =√2sin(x+π/4)+1很高兴为您解答：
y=cosx+sinx+1＝√2（√2/2cosx+√2/2sinx）+1=√2cos(x-π/4)+1 或√2sin(x+π/4)+1
