66. (sec A + tan A - 1) (sec A- tan A + 1) = 2 tan A
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[secA+(tanA-1)(secA-(tanA-1)]
=sec²A-(tanA-1)²
=1/cos²A-(tan²A-2tanA+1)
=1+tan²A-tan²A+2tanA-1
=(1-1)tan²A-tan²A + 2tanA
=0+0+2tanA
=2tanA=2tanA
hence verified!
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