Q2
(sec A + tan A – 1) (sec A - tan A + 1) = 2 tan A
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[secA+(tanA-1)(secA-(tanA-1)]
=sec^²A-(tanA-1)^²
=1/cos^²A-(tan^²A-2tanA+1)
=1+tan^²A-tan^²A+2tanA-1
=(1-1)tan^²A-tan^²A + 2tanA
=0+0+2tanA
=2tanA=2tanA
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