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Relation Between Integration and Differentiation

Integration and differentiation are inverse operations.

基本关系

定理 2
  • ddx ⁣[f(x)dx]=f(x)\dfrac{d}{dx}\!\left[\int f(x) dx\right] = f(x)
  • f(x)dx=f(x)+C\int f'(x) dx = f(x) + C

几何与意义

验证方法

Check by differentiating the result.

验证 2xdx=x2+C\int 2x dx = x^2 + C: (x2+C)=2x(x^2 + C)' = 2x.


练习题

练习 1

验证 (ex+sinx)dx=excosx+C\int (e^x + \sin x) dx = e^x - \cos x + C

参考答案

答案:对 excosx+Ce^x - \cos x + C 求导,得 ex+sinxe^x + \sin x,成立。


Summary

符号类型读音/说明在本文中的含义
\int数学符号integral不定积分符号
CC符号constant积分常数

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