ctg15градус*ctg30градус*ctg45градус*ctg60градус*ctg75=

Question

ctg15градус*ctg30градус*ctg45градус*ctg60градус*ctg75=

Answer 1

ctg15градус*ctg30градус*ctg45градус*ctg60градус*ctg75=ctg(15+75)*ctg(60+30)*ctg45=ctg90*ctg90*ctg45=0*0*1=0