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[" Letcosia "+beta=(4)/(5)" and let "sin...

[" Letcosia "+beta=(4)/(5)" and let "sin(alpha-beta)=(5)/(13)" ,where "0<=alpha,beta<=(pi)/(4)" .Then tan "2 alpha=],[[" (1) "(56)/(33)," (2) "(19)/(12)," (AlEEE "2010(4,-1),144]]

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