Ответы на вопрос:
1) cos (1-x)= 1/2 -1))=1/2 cos(x-1)=1/2 x-1= + arccos (1/2)+2πn x-1= + π/3 +2πn x= + π/3 +1+2πn 2) cos x/4 =4/5 x/4= + arccos 4/5 +2πn x= +4arccos 4/5 +8πn
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