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Ctan(x) = 1/tan(x)
tan(x)*[(1/tan(x)) + Tan(x)]
Tan(x)*[1/Tan(x)] = 1
Tan(x)*[Tan(x)] = Tan²(x)
Tan(x)*[ctan(x) + tan(x)] = 1 + Tan²(x)
Por identidades trigonometricas sabemos
1 + tan²(X) = Sec²(X)
Tan(x)*[ctan(x) + tan(x)] = Sec²(x)
Si se cumple la identidad