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

[" Let "cos(alpha+beta)=4/5" and let "sin(alpha-beta)=5/13" ,where "],[0<=alpha,beta<=pi4" .Then "tan2 alpha" is equal to "],[[" (a) "(20)/(7)," (b) "(25)/(16)],[" (c) "(56)/(33)," (d) "(19)/(12)]]

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