Question

найти tg2a если tga=0.6​

Answer 1

$\tg 2 \alpha = \frac{2 \tg \alpha }{1 - \tg^{2} \alpha }$

$= \frac{2 \times 0.6}{1 - {0.6}^{2} } = \frac{1.2}{0.64} = \frac{120}{64} = 1.875$