Помогите как это решать?!!помогите!!!
(sin(9π/4) - cos(11π/4))*sin(-3.5π) / cos(-28π/3) = -(sin(2π + π/4) - cos(2π + π - π/4))*sin(4π - π/2) / cos(10π - 2π/3) = (-cos(π - π/4) + sin(π/4))*sin(π/2) / cos(2π/3) = (cos(π/4) + sin(π/4))/(cos(π - π/3)) = -√2/cos(π/3) = -√2/0.5 = -2√2