2cos x (sin x -cos x)+1
5个回答
原式=sin2x+1-2cosx^2
=sin2x-cos2x
=(根号2)sin(2x-π/4)
相关问题
(1+cos x-sin x)/(1-sin x-cos x)+(1-cos x-sin x)/(1-sin x+cos
(1+sin2x-cos2x)/1+sin2x+cos2x
(sin3xsinx)sin2x+(cos3xcosx)cos2x =1/ 2 [(cos2x-cos4x)sin2x+
化简cos2(x)/1+sin(x) +sin2(x)/1+cos(x)
(1-cos2x)+sin2x=根号2(sin2x cosπ/4-cos2x sinπ/4)+1
求证(cos^2x-sin^2x)(cos^4x+sin^4x)+1/4sin2xsin4x=cos2x
求证:(sin x+cos x−1)(sin x−cos x+1)sin
sinx+sin3x+sin5x+.sin(2n-1)/cosx+cos3x+cos5x+.cos(2n-1)= sin
Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y)
(sin(180°+2x))/(1+cos2x)*(cos2x0/(cos(90°+x))=