（sin2a+cos2a-1)(sin2a-cos2a+1)=sin²2a-（cos2a-1）²=-2cos²2a+2cos2a=根号3 sin4a,即-2cos²2a+2cos2a=2√3sin2acos2a ,即2cos2a（1-cos2a-√3sin2a）=0,即4cos2asina（sina-√3cosa）=0即a=45°或a=60°
(sin2a+cos2a-1)(sin2a-cos2a+1)除以sin4a=根号3,a为锐角,求角a的值,
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