Question

ctg225°-ctg(-300°)+cos135°

Answer 1

ctg225-ctg(-300)+cos135=ctg(180+45)+ctg(360-60)+cos(180-45)=
=ctg45-ctg60-cos45=1-√/3-√2/2

Answer 2

ctg225-ctg(-300)+cos135=
ctg(180+45)+ctg(360-60)+cos(180-45)=
=ctg45-ctg60-cos45=1-√/3-√2/2