Найти: (sin37-sin53)/1-2sin^2 41 (37, 53, 41 - градусы)

Sin37 - sin 53 = sin37  - sin (90-37) = sin 37 - cos 37 
1-2sin^2 41 = cos 2 * 41  = 2cos^2 41 - 1 = cos^2 41 - sin^2 41

sin37 - sin 53  = 2 sin ((37-53)/2) cos((37+53)/2) = 2 sin (-8) sqrt(2)/2