calculus · worked example

Solve sin(2x)

Method: 連鎖律. Verified step-by-step solution with our free AI math solver.
Problem

ddxsin(2x)\frac{d}{dx}\sin(2x)

Step-by-step solution

  1. 辨識外層函數 sin(u)\sin(u) 與內層函數 u=2xu = 2x

  2. sin(u)\sin(u)uu 的導數為 cos(u)\cos(u)

  3. 內層 2x2xxx 的導數為 22

  4. 套用連鎖律:ddxsin(2x)=cos(2x)2\frac{d}{dx}\sin(2x) = \cos(2x) \cdot 2

  5. 化簡:結果為 2cos(2x)2\cos(2x)

Answer

2cos(2x)2\cos(2x)

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