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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