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(1- cos2θ) (1 + (cos2θ/sen2θ)) = 1
(1 - cos2θ) (sen2θ + cos2θ) / sen2θ = 1...............como sen2θ + cos2θ = 1, reemplazamos:
(1 - cos2θ) (1) / sen2θ = 1.......sen2θ pasa a multiplicar a 1:
(1 - cos2θ) = sen2θ
donde:
sen2θ + cos2θ = 1
con lo que queda demostrado