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How to write latex overset and underset: \overset \underset
\frac{f(x+\delta x)-f(x)}{\delta x}
\overset{\delta x\to 0}{\longrightarrow}
f'(x)
$$\frac{f(x+\delta x)-f(x)}{\delta x} \overset{\delta x\to 0}{\longrightarrow} f’(x) $$
A \overset{f}{\rightarrow} B
$$A \overset{f}{\rightarrow} B$$
\frac{f(x+\delta x)-f(x)}{\delta x}
\underset{\delta x\to 0}{\longrightarrow}
f'(x)
$$\frac{f(x+\delta x)-f(x)}{\delta x} \underset{\delta x\to 0}{\longrightarrow} f’(x) $$
A \underset{f}{\rightarrow} B
$$A \underset{f}{\rightarrow} B$$