1)arcsin(√3/2)=pi/3
arctg(tg(6pi/7-pi))=arctg(tg(-pi/7))=-pi/7
arcctg(ctg(-pi/3))=arcctg(tg(pi-pi/3))=2pi/3
pi/3-pi/7+2pi/3=pi-pi/7=6pi/7
k=6/7
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1)arcsin(√3/2)=pi/3
arctg(tg(6pi/7-pi))=arctg(tg(-pi/7))=-pi/7
arcctg(ctg(-pi/3))=arcctg(tg(pi-pi/3))=2pi/3
pi/3-pi/7+2pi/3=pi-pi/7=6pi/7
k=6/7