Question

2 sen alfa= tg 2 alfa

Answer 1

$2.Sen\alpha = Tan2\alpha$
$2.Sen\alpha = \frac{Sen2\alpha}{Cos2\alpha} 2.Sen\alpha = \frac{2.Sen\alpha.Cos\alpha}{Cos^{2}\alpha - Sen^{2}\alpha }$Despejamos$Cos^2 - Sen^2 = Cos Cos = Cos^2 + Cos^2 -1 0 = 2Cos^2 - Cos - 1 Dos respuestas Cos = -1/2 Cos = 1$