ojedax Posted June 16, 2013 Report Share Posted June 16, 2013 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 =) Link to comment Share on other sites More sharing options...
ElTom Posted June 19, 2013 Report Share Posted June 19, 2013 sen(a)^4 + cos(a)^4= sen(a)^4 + 2sen(a)^2*cos(a)^2 + cos(a)^4 - 2sen(a)^2*cos(a)^2= (sen(a)^2 + cosa)^2)^2 - 2sen(a)^2*cos(a)^2= 1 - 2sen(a)^2*cos(a)^2 Link to comment Share on other sites More sharing options...
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