1 + sin O + COSO
(sec A + tan A - 1) (sec A - tan A + 1) = 2 tan A
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Step-by-step explanation:
(secA+tanA-1)(secA-tanA+1)
={secA+(tanA-1)} {secA-(tanA-1)}
=sec²A-(tanA-1)²
=sec²A-tan²A+2tanA-1
=1+2tanA-1
=2tanA
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