(sec A-tan A-1)(secA -tanA+1)=2tanA
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L.H.S = (secA - tanA -1)(secA - tanA +1)
=sec^2A -secAtanA + secA -tanAsecA +tan^2A - tanA - secA +tanA -1
= sec^2A + tan^2A - 2tanAsecA + secA -secA - tanA +tanA -1
= 1 -2tanAsecA -1
= -2tanAsecA
=sec^2A -secAtanA + secA -tanAsecA +tan^2A - tanA - secA +tanA -1
= sec^2A + tan^2A - 2tanAsecA + secA -secA - tanA +tanA -1
= 1 -2tanAsecA -1
= -2tanAsecA
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