1. sin(30°)-cos(60°) = 0
2. 5*cos(90°)-3*ctg(60°) = -корень(3) = -1.73205080756888
3. 2*tg(45°)-sin(45°) = 2-1/корень(2) = 1.29289321881345
4. 4*ctg(30°)-6*sin(60°) = 4*корень(3)-27^(1/2) = 1.73205080756888
sin30-cos60* 5*cos90-3*ctg60 *2*tg45-sin45* 4*ctg30-6*sin60 = 1/2 - 1/2*5*0 - 3*(√3)/3*2*1 - (√2)/2*4*√3 - 6*(√3)/2 = 1/2 - 0-2√3 - 2√6 - 3√3 = 1/2 -5√3-2√(3*2) = 1/2- √3(5-2√2)
