化解sin^2αsin^2β+cos^2αcos^2β-1/2cos2αcos2β

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化解sin^2αsin^2β+cos^2αcos^2β-1/2cos2αcos2β化解sin^2αsin^2β+cos^2αcos^2β-1/2cos2αcos2β化解sin^2αsin^2β+cos

化解sin^2αsin^2β+cos^2αcos^2β-1/2cos2αcos2β
化解sin^2αsin^2β+cos^2αcos^2β-1/2cos2αcos2β

化解sin^2αsin^2β+cos^2αcos^2β-1/2cos2αcos2β
是不是:sin^2αsin^2β+cos^2αcos^2β-1/(2cos2αcos2β)
1/(2cos2αcos2β)还是1/2cos2α*cos2β?