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If A+B=(pi)/(2)rArr Tan A Tan B=1,rArr T...

If `A+B=(pi)/(2)rArr Tan A Tan B=1`,`rArr Tan(A-B)=(tan A-tan B)/(1+tan A tan B)=(tan A-tan B)/(2)`,`rArr tan A=tan B+2tan(A-B)`,`(tan40^(@)+2tan10^(@)):(tan70^(@)-Tan20^(@))=`

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If A+B=(pi)/(2)rArr Tan A Tan B=1 , rArr Tan(A-B)=(tan A-tan B)/(1+tan A tan B)=(tan A-tan B)/(2) , rArr tan A=tan B+2tan(A-B) , x= Tan""(5 pi)/(28)+2Tan""(pi)/(7) Then x

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