Question

найдите значение выражения
34/cos^2 101°+cos^2 191°

Answer 1

34/ (cos^2 101°+ cos^2 191°)= 
= 34 / (cos^2 (90+11)°  + cos^2 (180+ 11)°) = 
= 34/ (sin^2 11°  +cos^2 11°)  = 34/1  = 34