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y=cos²;x+4sinx+4 =1-sin²;x+4sinx+4 =-(sin²;x-4sinx+4)+1+4 =-(sinx-2)²;+5 因:-1≤sinx≤1所以可得: 當sinx=1時有最大值為:6 當sinx=-1時有最小值為:4
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