Mathematics
Mathematics, 10.09.2019 16:10, pr957362

(1+tana)^2+(1-tana)^2/(1+cota)^2+(1 -cota)^2 = tan^2a prove

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(1+tana)^2+(1-tana)^2/(1+cota)^2+(1 -cota)^2 = tan^2a prove...

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