1) 1-2sinXcosX/cos^2X-sin^2X=1-tanX/1+tanX2) tan^2X-sin^2X=tan^2X·sin^2X3) (cosX-1)^2+sin^2X=2-2cosX4) sin^4X+cos^4X=1-2sin^2Xcos^2X
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/30 09:09:44
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化简2*(sinxcosx-cos平方x)+1
sin^2xtanx+(cos^2x/tanx)+2sinxcosx-1+cos/sinxcosx
sin^2xtanx+cos^2x/tanx+2sinxcosx-(1+cosx/sinxcosx)化简
2sin^2x-sinxcosx-cos^2=1
2sin^2-sinxcosx-cos^2=1
化简y=2sinxcosx+2cos^2x-1
化简1+2sinxcosx+2cos²x
求cos^2x-sinxcosx-1/2单调增区间
求证 1+2sinxcosx/sin^2x-cos^2x=sin^2x-cos^2x/1-2sinxcosx
证明1-2sinxcosx/cos^2x-sin^2x=cos^2x-sin^2/1+2sinxcosx
已知tanx=2,则(1)1/4sin方x-3sinxcosx/cos方x+2sinxcosx
tanx=2,则1/4sin²x-3sinxcosx/cos²x+2sinxcosx=多少
证明1-2sinxcosx/cos^2x-sin^2x=1-tanx/1+tanx
证明:(1+2sinXcosX)/(sin^2X-cos^2X)=(tanX+1)/(tanX-1)
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!
(cos^2x-sin^2x)/(1-2sinxcosx)=(1+tanx)/(1-tanx)证明题