Tìm giá trị lớn nhất giá trị nhỏ nhất
Cos(x+π/3)+ cos(x-π/3)
1 answer:
Answer:
GTLN : 1 GTNN: -1
Step-by-step explanation:
Ta có:

mà 
Nên Max
,
∈ 
Min
,
∈ 
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