Question

(tga+ctga)^2+(sina*cosa)^2=

Answer 1

Ответ:

$= {1}^{2} + { \sin}^{2} \alpha + 2 \sin \alpha \cos \alpha + { \cos }^{2} \alpha = 1 + 1 + \sin2 \alpha = \sin2 \alpha + 2$