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What is the meaning of integration under integral sign? 

>What is the meaning of integration under integral sign? 

**In simple** : <br/>
<span style="margin:80px">Differentiation means division.</span><br/>
<span style="margin:80px">Integration means adding whole stuffs.</span><br/>
<span style="margin:80px">When studying Differentiation under integral sign, I just thought I am differentiating under integral just to solve the solution easily.</span>

But, I can't understand what's the meaning of integration under integral sign.