求证:(sin2x)除以(sinx+cosx-1)(sinx-cosx+1)等于cotx/2
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/18 23:46:30
求证:(sin2x)除以(sinx+cosx-1)(sinx-cosx+1)等于cotx/2求证:(sin2x)除以(sinx+cosx-1)(sinx-cosx+1)等于cotx/2求证:(sin2
求证:(sin2x)除以(sinx+cosx-1)(sinx-cosx+1)等于cotx/2
求证:(sin2x)除以(sinx+cosx-1)(sinx-cosx+1)等于cotx/2
求证:(sin2x)除以(sinx+cosx-1)(sinx-cosx+1)等于cotx/2
等式左边=2sinxcosx/[sinx+(cosx-1)][sinx-(cosx-1)]=2sinxcosx/[sin^2x-(cosx-1)^2]=2sinxcosx/(sin^2x-cos^2x+2cosx-1)=2sinxcosx/(2cosx-2cos^2x)=sinx/(1-cosx)=2sin(x/2)cos(x/2)/[1-2cos^2(x/2)+1]=sin(x/2)cos(x/2)/[1-cos^2(x/2)]=sin(x/2)cos(x/2)/sin^2(x/2)=cot(x/2)
过程尽量给你写的很详细了,你要是变角公式很熟练的话,中间很多步可以省略直接得出答案哈
求证:(sin2x)除以(sinx+cosx-1)(sinx-cosx+1)等于cotx/2
2sinx-sin2x的差除以2sinx+sin2x化简
求证:[(sinx+cosx-1)(sinx-cosx+1)]/sin2x=(1-cosx)/sinx
(sin2x)除以(sinx+cosx-1)(sinx-cosx+1)等于cotx/2 证明:
解三角方程sin2x除以cosx等于cos2x除以sinx
求证(1+sin2x)/(cosx+sinx)=cosx+sinx
求证:sin2x/(1+sinx+cosx)=sinx+cosx-1
为什么sinx+(1/cosx)=1/2sin2x+1?你是不是漏了除以cosx?因为cosx【sinx+(1/cosx)】=1/2sin2x+1
求证:1/sin2x+1/tan2x+1/sinx=1/tan(x/2)
求证:(1-2sinx×cosx)/cos2x-sin2x=(cos2x-sin2x)/(1+2sinx×cosx)
求证[sinx(1+sinx)+cosx(1+cosx)][sinx(1-sinx)+cos(1-cosx)]=sin2x
求证sinx+sin3x+sin2x=1+cos2x+cosx
求证sin3x/2sinx/2-2sinxcosx=sin2x
求证:sin2x/[sinx+(cosx-1)][sinx-(cosx-1)]=(1+cosx)/sinx
求证一道三角函数题,求证:sin2x/(1+sinx+cosx)=sinx+cosx-1
(-2sin2x)(sinx+cosx)=?
sin2X/(1+cosX+sinX)化简
∫x(sin2x-sinx)dx