# §6.3 Graphics

## §6.3(i) Real Variable

Figure 6.3.1: The exponential integrals and , .
Figure 6.3.2: The sine and cosine integrals , .

For a graph of see Figure 6.16.2.

## §6.3(ii) Complex Variable

Figure 6.3.3: , , . Principal value. There is a cut along the negative real axis. Also, logarithmically as .
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