化简sin^4x/sinx-cosx - (sinx+cosx)cos^2x/tan^2x-1

化简cosX +sin X) /(cosX -sinX) 化简（cosX +sin X) /(cosX -sinX) 化简sin^4x/sinx-cosx - (sinx+cosx)cos^2x/tan^2x-1 化简f(x)=4sinx*sin^2（(π+2x）/4)+（cosx+sinx）（cosx-sinx） 化简[sin^2(x)]/(sinx-cosx)-(sinx+cosx)/[tan^2(x)-1]-sinx 3sinx-2cosx=0 (1)(cosx-sinx)/(cosx+sinx)+(cosx+sinx)/(cosx-sinx) (2)sin^2 x-2sinxcosx+4cos^2 x 化简(sin^2x/sinx-cosx) -(sinx +cosx/tan^2x-1) 化简：sin^2`x/(sinx-cosx)- (sinx+cosx)/tan^2`x - 1. 2sina(x-π/4)sin(x+π/4) 怎么转换成(sinx-cosx)(sinx+cosx)? (sin^x/sinx-cosx)-sinx+cosx/tan^2x-1 化简sin(x+y)sinx+cos(x+y)cosx 化简sin(x+y)sinx+cos(x+y)cosx等于? 化简cos(x+y)sinx-sin(x+y)cosx 化简cos(x+y)sinx-sin(x+y)cosx 为什么cosX+sinX=...为什么cosx+sinx=根号2 sin(x+π/4) 化简：(1)根三sinx+cosx (2)sinx-cosx (3)3sinx+4cosx (4)根二sin（π/4-x)化简：(1)根三sinx+cosx (2)sinx-cosx (3)3sinx+4cosx (4)根二sin（π/4-x) 求证sinx-cosx=根号2sin(x-π/4) 为什么sinx-cosx=√2sin(x-Pi/4)?