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The value of- (1+ tan11') (1+ tan34')/(1+ tan17') (1+ tan28')
remember if a+b=45 ,then (1+tanA)(1+tanB)=2
since,in (1+tanA)(1+tanB) ,A=11 and B =34 hence a+b=45,
similarly 2/2=1 ANS.
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