secA+tanA/secA-tanA=1+2secAtanA+2tan²A
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Step-by-step explanation:
secA+tanA=1/secA-tanA
so,secA+tanA/secA-tanA=(secA+tanA)²
=sec²A+tan²A+2secAtanA
=1+2secAtanA+2tan²A
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