∫ e c x d x x = ln | x | + ∑ i = 1 ∞ ( c x ) i i ⋅ i ! {\displaystyle \int {\frac {e^{cx}\;dx}{x}}=\ln |x|+\sum _{i=1}^{\infty }{\frac {(cx)^{i}}{i\cdot i ...
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