sin2x-cos2x+1如何化解可等于√2sin(2x-π/4)+1

问题描述:

sin2x-cos2x+1如何化解可等于√2sin(2x-π/4)+1

y=sin2x-cos2x+1
=√2(√2/2sin2x-√2/2cos2x)+1
=√2sin(2x-π/4)+1太棒了!多谢你啦不谢哦。。