Find the value of (sec A + tan A – 1)(sec A – tan A – 1).
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Step-by-step explanation:
(secA+(tanA+1)) (secA-(tanA+1))
(sec²A-(tanA+1)²)
(sec²A-(tan²A-2tanA+1))
(sec²A-tan²A+2tanA-1)
(1+2tanA-1)
2 tanA
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