Task/28346589
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( sin²35° - cos²145°) / cos100°*cos350° =
( (1- cos2*35°) / 2- (1+cos2*145°) / 2 ) / cos(90°+10°)*cos(360°-10°) =
- ( cos290°+cos70°) / -2 sin10°*cos10°=( cos(360°-70°) + cos70°) / 2sin20° =
(cos70°+cos70°)/2sin20°=cos70°/sin20°=sin20°/sin20° =1 .