Prove that 1+cosa/1-cosa=(coseca+cota)^2

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1+cosa/1-cosa=(coseca+cota)^2

1+cosa/1-cosa=coseca+cota

1+cosa/(1 tana 2 coseca - cota)

cosa/1+sina+1+sina/cosa=2seca

coseca-1/coseca+1=(cosa/1+sina)^2

prove that 1+cosa/1-cosa=(coseca+cota)

1-cosa/1-cosa coseca-cota ²

(coseca-cota)^2+1/seca(coseca-cota)=2cota

(coseca+cota)^2=seca+1/seca-1
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