Помогите, пожалуйста! Найдите корни уравнения на заданном промежутке: cos(x)=1/2 где X принадлежит (1;6)

cos(x)=sqrt2/2 x=[-pi/4;12]

cos(x)=-1/2 x=[2;10]

cos(x)=-sqrt2/2 x=[-4;5pi/4]

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