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1.y'={1'×[x(2+5x)^10]-[x(2+5x)^10]'×1}/[x(2+5x)^10]'.繼續化簡即可. 2.y'=(-xcos2xsin2x)'=-0.5×(xsin4x)'=-0.5×(4xcos4x+sin4x).
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