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[(1-tan)^(2)+(1-cot)^(2)=(sec A-cos2c+1)...

[(1-tan)^(2)+(1-cot)^(2)=(sec A-cos2c+1)^(2)],[tan A=ul(p)-z_(1d)]

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((1+tan^(2)A)/(1+cot^(2)A))=((1-tan A)/(1-cot A))^(2)=tan^(2)A

Prove that (1+tan^(2)A)/(1+cot^(2)A)=((1-tan A)/(1-cot A))^(2)=tan^(2)A

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