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Question

If AB=3π4, then show that (1tanA)(1+tanB)=2

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Solution

Given AB=3π4
tan(AB)=tan3π4
tanAtanB1+tanAtanB=1
tanAtanB=1tanAtanB
tanBtanAtanAtanB=1
tanBtanAtanBtanA+1=2
tanB(1tanA)+(1tanA)=2
(1tanA)(1+tanB)=2

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