2cos1140-1/2sin *2100-3tg1470-1:3ctg1575

2 * cos 1140 - 1/2 * sin 2100 - 3 * tg 1470 - 1/3 * ctg 1575 =

= 2 * cos (1080 + 60) - 1/2 * sin (2160 - 60) - 3 * tg (1440 + 30) - 1/3 * ctg (1620 - 45) = 

= 2 * cos 60 - 1/2 * (-sin 60) - 3 * tg 30 - 1/3 * (-ctg 45) = 

= 2 * 1/2 + 1/2 * √3/2 - 3 * 1/√3 + 1/3 * √2/2 = 

= 1 + √3/4 - 3/√3 + √2/6 = 

= 1+ √3/4 - √3/3 + √2/6 = 

= 1 + 3√3/12 - 4√3/12 + 2√2/12 = 

= 1 + (3√3 - 4√3 + 2√2)/12 = 

= 1 + (-√3 + 2√2)/12