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(tan(pi/4+x))/(tan(pi/4-x))=((1+tanx)/(1...

` (tan(pi/4+x))/(tan(pi/4-x))=((1+tanx)/(1-tanx))^2`

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If x=tan ((pi)/(4)+A)+tan(B-(pi)/(4)) and y=tan ((pi)/(4)+A)*tan (B-(pi)/(4)) then (x)/(1-y)=