改为同义句：I choose what _____ ______ for the fashion show.

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• 在三角形ABC中,若sin(2π-A)=-根号二sin(π-B),根号三cosA=-根号二(π-B)-sinA=-√2sinB,sinA=√2sinB√3cosA=√2cosB,cosA=√(2/3)cosB(sinA)^2+(cosA)^2=1所以2(sinB)^2+(2/3)(cosA)^2=1(4/3)(sinB)^2+(2/3)[(sinB)^2+(cosA)^2]=1(4/3)(sinB)^2+(2/3)=1(sinB)^2=1/4(4/3)(sinB)^2+(2/3)[(sinB)^2+(cosA)^2]=1这玩意怎么得出来的
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