Q19 of 90 Page 7

Mark the correct alternative in the following:

If A – B = π /4, then (1 + tan A) (1 – tanB) is equal to



1+tan A tan B=tan A-tan B


tan A-tan B-tan A tan B=1


add both side 1


1+tan A-tan B-tan A tan B=1+1


(1+tan A)(1+tan B)=2


Case2:


put A=0 AND


(1+tan A )(1-tan A )=1× 2

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