cos2α-1/[2(cosα-sinα)]+cosα/[1-tanα] 化简
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cos2α-1/[2(cosα-sinα)]+cosα/[1-tanα]化简cos2α-1/[2(cosα-sinα)]+cosα/[1-tanα]化简cos2α-1/[2(cosα-sinα)]+c
cos2α-1/[2(cosα-sinα)]+cosα/[1-tanα] 化简
cos2α-1/[2(cosα-sinα)]+cosα/[1-tanα] 化简
cos2α-1/[2(cosα-sinα)]+cosα/[1-tanα] 化简
=cos2a-1/[2(cosa-sia)]+(cosa)^2/[cosa-sina]
=cos2a+[2(cosa)^2-1]/[2(cosa-sina)]
=cos2a+cos2a/[2(cosa-sina)]
=cos2a[1+1/(2(cosa-sina))]
=cos2a[2(cosa-sina)+1]/[2(cosa-sina)]
=(cosa-sina)(cosa+sina)[2(cosa-sina)+1]/[2(cosa-sina)]
=(cosa+sina)[2(cosa-sina)+1]/2
=[(2((cosa)^2-(sina)^2)+cosa+sina]/2
=(2cos2a+cosa+sina)/2
=cos2a+(cosa+sina)/2
化简(sinα-cosα)^2-1/-cos2α
sinα-cosα=1/2 求cos2α
sin²α*sin²β+cos²α*cos²β-1/2cos2αcos2β=(1-cos2α)/2*(1-cos2β)/2+(1+cos2α)/2*(1+cos2β)/2-1/2cos2α*cos2β=1/4(1+cos2α*cos2β-cos2α-cos2β)+1/4(1+cos2α*cos2β+cos2α+cos2β)-1/2cos2α*cos2β=1/4+1/
化简(sinα)^2*(sinβ)^2+(cosα)^2(cosβ)^2-1/2cos2αcos2β
化简:sin^2αsin^2β+cos^2αcos^2β-1/2cos2αcos2β
化解sin^2αsin^2β+cos^2αcos^2β-1/2cos2αcos2β
化简:sin²αsin²β+cos²αcos²β-1/2cos2αcos2β
化简 sin²αsin²β+cos²αcos²β-1/2(cos2αcos2β)
sin²αsin²β+cos²αcos²β-【(1/2)*cos2αcos2β】
化简:sin²αsin²β+cos²αcos²β—1/2cos2αcos2β
化简sinα^2sinβ^2+cos^2cosβ^2-1/2cos2αcos2β
化简:sinαcosαcos2α
sinαcosαcos2α化简
sinαcosαcos2α=
化简sin²αsin²β+cos²αcos²β-1/2cos2αcosβ
化简sin²αsin²β+cos²αcos²β-1/2cos2αcosβ
已知cosα≠1/2,化简(sin2α+sinα)/(cos2α+cosα+1)
cos2α-1/[2(cosα-sinα)]+cosα/[1-tanα] 化简