Ctg225°-ctg(-300°)+cos135°
Ctg225-ctg(-300)+cos135= ctg(180+45)+ctg(360-60)+cos(180-45)= =ctg45-ctg60-cos45=1-√/3-√2/2
Ctg225-ctg(-300)+cos135=ctg(180+45)+ctg(360-60)+cos(180-45)= =ctg45-ctg60-cos45=1-√/3-√2/2