(sec A + tan A -1) (sec A - tan A + 1) = 2Tan A
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Step-by-step explanation:
LHS= (secA+tanA-1)(secA-tanA+1)
→ {secA+(tanA-1)} {secA-(tanA-1)}
→sec²A-(tanA-1)²
→sec²A-(tan²A+1-2tanA)
→(sec²A-tan²A)-1+2tanA
→1-1+2tanA
→2tanA
LHS=RHS
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