फलन का समाकलन कीजिए: $x \log x$

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माना $I = \int x \log x \, dx$.
खंडशः समाकलन (Integration by parts) के सूत्र का उपयोग करते हुए: $\int u \cdot v \, dx = u \int v \, dx - \int \left( \frac{du}{dx} \int v \, dx \right) dx$.
$LIATE$ नियम के अनुसार $u = \log x$ (प्रथम फलन) और $v = x$ (द्वितीय फलन) लेने पर:
$I = \log x \int x \, dx - \int \left( \frac{d}{dx} \log x \cdot \int x \, dx \right) dx$
$I = \log x \cdot \frac{x^2}{2} - \int \left( \frac{1}{x} \cdot \frac{x^2}{2} \right) dx$
$I = \frac{x^2 \log x}{2} - \int \frac{x}{2} \, dx$
$I = \frac{x^2 \log x}{2} - \frac{1}{2} \cdot \frac{x^2}{2} + C$
$I = \frac{x^2 \log x}{2} - \frac{x^2}{4} + C$,जहाँ $C$ समाकलन स्थिरांक है।

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