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extrema / usr / share / extrema / Help / Functions / expint.htm
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<TITLE>Exponential integrals</TITLE>
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<font size="+3" color="green"><B>Exponential integrals</B></font></P>
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<TD width="15%" valign="top"><B>Syntax</B>:</TD>
<TD width="85%"><CODE>
y = EXPINT(x)<br />
y = EI(x)<br />
y = EXPN(x,n)</code>
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 <img src="expintI01.png"></p>
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 <img src="expintI02.png"></p>
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 <img src="expintI03.png"></p>
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 where &nbsp;&nbsp;&nbsp;<img src="expintI04.png"> &nbsp;&nbsp;&nbsp;&nbsp;and
 &nbsp;&nbsp;&nbsp;<img src="expintI05.png">
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