Integrate:
∫
e
27
x
1
+
e
9
x
d
x
\displaystyle \int\frac{{{e}^{{{27}{x}}}}}{{{1}+{e}^{{{9}{x}}}}}{\left.{d}{x}\right.}
∫
1
+
e
9
x
e
27
x
d
x
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Question 6
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