sec-tan/sec+tan =1-2sec×tan+tan2
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Step-by-step explanation:
(sec-tan)(sec-tan)/(sec+tan)(sec-tan)
=(see-tan)²/(sec²-tan²)
=see²-2tan×sec+tan²
=1+tan²-2tan×sec+tan²
=1-2tan×sec+2tan²
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