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y=sinα/(cosα+2)的值域令y'=[(cosα+2)cosα+sin²α]/(cosα+2)²=(cos²α+2cosα+sin²α)/(cosα+2)²=(1+2cosα)/(cosα+2)²=0由1+2cosα=0,cosα=-1/2,得駐點α=2kπ±2π/3;取k=...
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