How can I split the following equation that goes beyond the margin?

 \sum_{i=0}^{\Delta_1-1}{\frac{1}{i!}[(-s)^i  \frac{\delta^i}{\delta(s)^i}(\exp(-s^{\frac{2}{\alpha}} \lambda_1 (\eta_1 P_1)^{\frac{2}{\alpha}}C(\alpha,\psi_1))
(\exp(-s^{\frac{2}{\alpha}} \lambda_2 (\eta_2 P_2)^{\frac{2}{\alpha}}C(\alpha,\psi_2))}
  • Welcome to TeX.SX! As the code stands, there will be two equation numbers. Is it really what you want?
    – egreg
    Dec 26 '13 at 20:44
  • 3
    I suggest a label that's more informative than eq17 since it might not be equation 17 as you revise the document. Dec 26 '13 at 20:56

Using multline you can just use \\ to change line.

(-s)^i \frac{\delta^i}{\delta(s)^i}
\Big( \exp(-s^{\frac{2}{\alpha}} \lambda_1 (\eta_1 P_1)^{\frac{2}{\alpha}}C(\alpha,\psi_1) \Big)  \\
\Big( \exp(-s^{\frac{2}{\alpha}} \lambda_2 (\eta_2 P_2)^{\frac{2}{\alpha}}C(\alpha,\psi_2) \Big)

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