tanA+secA-1/tanA-secA+1=tanA+secA
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tanA+secA-1/tanA-secA+1=tanA+secA
L.H.S=tanA+secA-(sec^2A-tan^2A)/tanA-secA+1
tanA+secA-(secA+tanA)(secA-tanA)/tanA-secA+1
tanA+secA (1-(secA-tanA)/tanA-secA+1
tanA+secA (1-secA+tanA)/1-secA+tanA
tanA+secA R.H.S
HENCE PROOF
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