化简2sinacosa-cosa/1+sin^2a-sina-cos^2a
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化简2sinacosa-cosa/1+sin^2a-sina-cos^2a化简2sinacosa-cosa/1+sin^2a-sina-cos^2a化简2sinacosa-cosa/1+sin^2a-
化简2sinacosa-cosa/1+sin^2a-sina-cos^2a
化简2sinacosa-cosa/1+sin^2a-sina-cos^2a
化简2sinacosa-cosa/1+sin^2a-sina-cos^2a
1+sina+/cosa=(sina+cosa)/cosa=1/cosa
所以1/[cosa根号(1+sin^2a/cos^2a)]
=1/(cosa*|1/cosa|)
1/sina-1=(1-sina)/(sina)=(cosa/sina)=cota
所以2/[根号(1/sin^2a-1)tana]
=2/(|cota|*tana)
sin^2a-sina-cos^2a
化简 1+sina+cosa+2sinacosa/1+sina+cosa
化简:1+sina+cosa+2sinacosa/1+sina+cosa
sinacosa=1/2,sina-cosa=?
求 :1+sinA+cosA+2sinAcosA/1+sinA+cosA
证明(1+sina+cosa+2sinacosa)/1+sina+cosa=sina+cosa
求证:(1+sina+cosa+2sinacosa)/(1+sina+cosa)=sina+cosa
证明1+sina+cosa+2sinacosa/1+sina+cosa=sina+cosa,
求证:1+sinA+cosA+2sinAcosA/1+sinA+cosA=sinA+cosA
求证:1+sina+cosa分之1+sina+cosa+2sinacosa=sina+cosa
(1+sina+cosa+2sinacosa)/(1+sina+cosa)如何推出=sina+cosa
求证(1+sina+cosa+2sinacosa)/(1+sina+cosa)=sina+cosa
1.若tana=根号2,求(1)(sina+cosa)/(cosa-sina)的值 (2)2sin^2a-sinacosa+cos^2a的值 2.化简(sin^2atana+cos^2a/tana+2sinacosa)sinacosa
(2sin²a+2sinacosa)/[1+(sina/cosa)]=2sinacosa怎么解出来的
化简2sinacosa-cosa/1+sin^2a-sina-cos^2a
sina+cosa=1/2,则sinacosa=?
求证:sinA+cosA=√1+2sinAcosA
sinacosa=1/2,tana+cosa/sina的值
sina+cosa=1/2求sinacosa=?