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範例 09：直接求sin(x)的導函數 |
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從幾何上如何找到sin(x)的微分呢？ |
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《 解答 》 |
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直接求 
把θ變動△θ，sinθ從 
變到  ，我們要了解
與△θ之比，△θ是一小段弦長，是斜線區域這個近似直角三角形的斜邊，此
與△θ之比之比可以想成是 cosθ
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About
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