<cosA-sinA+1>⁄<cosA+sinA-1> = cosecA+cotA
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LHS__divide both numerator and denominator by sinA...= (cotA-1+cosecA)/(cotA+1-cosecA)=(cotA+cosec^2A-cot^2A+cosecA)/(cotA+1-cosecA)={cotA+(cosecA-cotA)(cosecA+cotA)+cosecA}/(cotA+1-cosecA)={(cotA+cosecA) (1+cotA-cosecA)}/(1+cotA-cosecA)=cosecA+cotA=RHS
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sorry I don't know.
sorry
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