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2.(cosa)/sena)*(1/cosa)=coseca
1/sena=coseca
coseca=coseca
escribimos tan y cot en función de sen y cos
sena/cosa+cosa/sena ⇒ suma de fracciones
sen²a+cos²a/sena.cosa ⇒ sen²+c0s²=1
1/sena .1/cosa ⇒ y al fin
tana+cosa = csec a .seca