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y=cos^2x+2asinx-1 =1-sin^2x+2asinx-1 =a^2-a^2+2asinx-sin^2x =a^2-(a-sinx)^2 當(a-sinx)^2是最大值時,y取最小值. 需要根據a的值,來判斷(a-sinx)^2的最大值.有點囉嗦
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