(secx-tanx) /secx+tanx=1-2secxtanx+2tan²x
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(secx- tanx)×( secx- tanx)/ (secx+ tanx)× (secx - tanx)
sec^2x + tan^ 2 x- 2secxtanx/ secx^2 x - tan^2x ( which is =1)
sec^2 x can be written as ( 1+ tan^2x)
1+ tan^2x + tan^2 x - 2secxtanx
1- 2secxtanx + tan^2x....Answer
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