Question

1+ cosa 1-cos2a надо решить,помогайте

Answer 1

(Tga+Ctga)(1^2 - cos^2 a) = (tga+ctga)(sin^2 a) = (sina/cosa+cosa/sina) * sin^2 a= ((sin^2+cos^2)/sina*cosa ) * sin^2(a)= tga