y=sinx+cosx怎样化简

问题描述:

y=sinx+cosx怎样化简

√2/2y=√2/2sinx+√2/2cosx
√2/2y=cos(π/4)sinx+sin(π/4)cosx
√2/2y=sin(x+π/4)
y= √2sin(x+π/4)