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Ayuda con Trigonometría


ojedax

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Alguien me puede ayudar a demostrar los siguiente:

 

Sen^4 (a) + Cos^4 (a) = 1 - 2( Sen^2 (a) * Cos^2 (a))...

 

descompongo y descompongo en otras identidades pero no logro establecer dicha igualdad, de antemano gracias =)

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