2cos(α+β)+cos2α+cos2β=2cos(α+β)+2cos(α+β)cos(α-β
sin²α·cos²β+cos²α·cos²β-1/2cos2α·cos2β的值
化简:cos2α-cos2β/cosα-cosβ
cos^2(α+β)+cos^2(α-β)-cos2αcos2β
化简sinα^2sinβ^2+cos^2cosβ^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(sinα)^2*(sinβ)^2+(cosα)^2(cosβ)^2-1/2cos2αcos2β
Sin²αSin²β+Cos²αCos²β-1/2Cos2αCos2β
化简:sin²αsin²β+cos²αcos²β-1/2cos2αcos2β
sin²α*sin²β+cos²α*cos²β-1/2cos2αcos2β
化简:sin²αsin²β+cos²αcos²β—1/2cos2αcos2β
sin²αsin²β+cos²αcos²β-【(1/2)*cos2αcos2β】