4(1+cosA)/2-(2cos^2A-1)=7/2 前面这个怎么变成4cos^2A-4cosA+1=0
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4(1+cosA)/2-(2cos^2A-1)=7/2 前面这个怎么变成4cos^2A-4cosA+1=0
4(1+cosA)/2-(2cos^2A-1)=7/2 前面这个怎么变成4cos^2A-4cosA+1=0
4(1+cosA)/2-(2cos^2A-1)=7/2 前面这个怎么变成4cos^2A-4cosA+1=0
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