simplify sec A ( 1 - sin A ) ( se A + tan A )
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(secA-secA×sinA) (secA+tanA)
(sec A-1/cos A×sin A) (secA+tanA)
(secA-sinA/cosA) (secA+tanA)
(secA-tanA) (secA+tanA)
sec^2A-tan^2A
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