怎样 求证1-2sinxcosx/cos^2=1-tanx/1+tanx
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/22 18:16:38
怎样求证1-2sinxcosx/cos^2=1-tanx/1+tanx怎样求证1-2sinxcosx/cos^2=1-tanx/1+tanx怎样求证1-2sinxcosx/cos^2=1-tanx/1
怎样 求证1-2sinxcosx/cos^2=1-tanx/1+tanx
怎样 求证1-2sinxcosx/cos^2=1-tanx/1+tanx
怎样 求证1-2sinxcosx/cos^2=1-tanx/1+tanx
左边分子 1-2sinxcosx= sinx^2+cosx^2-2sinxcosx= (cosx-sinx)^2
分母 cos2x=cosx^2-sinx^2=(cosx-sinx)(sinx+cosx)
上下约去 (cosx-sinx)后变为 (cosx-sinx)/(cosx+sinx)
1-2sinxcosx/cos^2x
=(cosx-sinx)/(cosx+sinx)
{分子分母同时除以cosx}
=(1-tanx)/(1+tanx)
怎样 求证1-2sinxcosx/cos^2=1-tanx/1+tanx
求证 1+2sinxcosx/sin^2x-cos^2x=sin^2x-cos^2x/1-2sinxcosx
求证 (1-2sinxcosx)/(cos^2x-sin^2x)=(1-tan2x)/(1+tan2x)
求证1+2sinxcosx/cos^2x-sin^2x=1+tanx/1-tanx
求证(1-2sinxcosx)/(cos^2x-sin^2x)=(1-tanx)/(1+tanx)SOS!
求证:(1-2sinxcosx)/(cos^2x-sin^2x)=(1-tanx)/(1+tanx)
求证:(1-2sinxcosx)/(tanx-1)=1/(tanx+cotx)-cos^2
求证1+2sinxcosx/cos平方x-sin平方x=1+tanx/1-tamx
求证(1-2sinxcosx)/(cos²x-sin²x)=(1-tanx)/(1+tanx)
求证:1-2sinxcosx/cos方x-sin方x=1-tan/+tan
化简2*(sinxcosx-cos平方x)+1
sin^2xtanx+(cos^2x/tanx)+2sinxcosx-1+cos/sinxcosx
求证2sinxcosx/(sinx+cosx-1)(sinx-cos+1)=sinx/1-cosx2sinxcosx/(sinx+cosx-1)(sinx-cos+1)=sinx/(1-cosx)
求证::(1-2sin2x·coax)/(cos²x-sin²x)=(cos^2x-sin^2x)/(1+2sinxcosx)
这条三角函数怎样化简求周期f(x)=-1+2√3sinxcosx+2cos²x
求证2 sinxcosx+sin^3xsecx+cos^3xcscx=tanx+cotx
sin^2xtanx+cos^2x/tanx+2sinxcosx-(1+cosx/sinxcosx)化简
2sin^2x-sinxcosx-cos^2=1