sinπ/3=cosπ/6=√3/2
sinπ/4=cosπ/4=√2/2
sinπ/6=cosπ/3=1/2
tgπ/3=ctgπ/6=√3
tgπ/4=ctgπ/4=1
tgπ/6=ctgπ/3=√3/3