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\[\Delta x = 5-3\qquad \int_{\Delta x} x^3 dx=?\]
\[\int_3^5 \frac{d}{dx}\left(\frac{x^4}{4}\right) dx=?\]
\[\int_{\Delta x} \frac{d}{dx}\left(\frac{x^4}{4}\right) dx=\Delta y=\frac{5^4}{4}-\frac{3^4}{4}\]
\[\int_{\Delta x} \frac{1}{x} dx=?\]
\[\frac{d}{dx}(\ln x)=\frac{d}{dx}\int_{\Delta x} \frac{1}{x}dx=\frac{1}{x}\]
\[\ln x+C:=\int_c^x\frac{1}{x} dx\]