Prove that cosA-sinA/cosA+sinA=sec2A-tan2A

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How to prove cosA-sinA/cosA+sinA=sec2A-tan2A
1. To Prove take R.H.S first that is sec2A-tan2A
2. convert sec2A into 1/cos2A and tan2A into sin2A/cos2A
3. on solving we get our required L.H.S
Hence we proved cosA-sinA/cosA+sinA=sec2A-tan2A

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