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[" 163.Let "cos(alpha+beta)=(4)/(5)" and...

[" 163.Let "cos(alpha+beta)=(4)/(5)" and "sin(alpha-beta)=(5)/(13)" ,where "],[qquad 0<=alpha,beta<=(pi)/(4)" .Then,tan 2"alpha" is equal to "],[[" (a) "(25)/(16)," (b) "(56)/(33)," (c) "(19)/(12)," (d) "(20)/(7)]]

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