y=2cosx+1
cosx∈[-1; 1]
2cosx∈[-2; 2]
2cosx+1∈[-1; 3]
Ответ: ymin=-1, ymax=3
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y=2cosx+1
cosx∈[-1; 1]
2cosx∈[-2; 2]
2cosx+1∈[-1; 3]
Ответ: ymin=-1, ymax=3