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y=2cos²;x+5sinx-4=2(1-sin²;x)+5sinx-4=-2sin²;x+5sinx-2=-2(sin²;x- 5sinx /2)-2=-2(sinx -5/4)²;+9/8當sinx=1時,y有最大值ymax=-2(1-5/4)²;+ 9/8=1當sinx=-1時,y有最小值ymin=-2(-1-5/4)…
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