2cosx=1
cosx=1/2
x=+-arccos(1/2)+2пk
x=+-п/3 +2пk
k ∈ Z (Целые числа)
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2cosx=1
cosx=1/2
x=+-arccos(1/2)+2пk
x=+-п/3 +2пk
k ∈ Z (Целые числа)