$D$ denotes $\frac{d}{dx}$
- $D c=0$
- $D x=1$
- $D \frac{1}{x}=-\frac{1}{x^2}$
- $D x^n=nx^{n-1}$
- $D \sqrt{x}=\frac{1}{2\sqrt{x}}$
- $\int 1 dx=x$
- $\int x dx=\frac{x^2}{2}$
- $\int x^n dx=\frac{x^{n+1}}{n+1}$
- $\int \frac{1}{x^2} dx=-\frac{1}{x}$
- $\int \frac{1}{\sqrt{x}} dx=2 \sqrt{x}$
- $\int \sqrt{x\, dx=\frac{}2{}3}x^{2/3}$
- $\frac{1}{x}\, dx=\ln x$
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