2cos x (sin x -cos x)+1_数学解答

2cos x (sin x -cos x)+1

人气：301 ℃　时间：2020-05-10 22:02:02

解答

2cosx (sinx -cosx)+1 =2sinxcosx-2cosx^2+1
=sin2x+1-2cosx^2
=sin2x-cos2x
=√2sin(2x-π/4)