Difference between revisions of "Derivative of cosine integral"
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Revision as of 19:41, 10 December 2016
Theorem
The following formula holds: $$\dfrac{\mathrm{d}}{\mathrm{d}z}\mathrm{Ci}(z) = \dfrac{\cos(z)}{z},$$ where $\mathrm{Ci}$ denotes the cosine integral.
