Cosine integral

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The cosine integral, $\mathrm{Ci}$, is defined by $$\mathrm{Ci}(z) = -\displaystyle\int_z^{\infty} \dfrac{\cos t}{t} \mathrm{d}t, \quad |\mathrm{arg} z|<\pi.$$

Relationship to other functions[edit]

Derivative of cosine integral
Antiderivative of cosine integral
Relationship between exponential integral Ei, cosine integral, and sine integral

Videos[edit]

Laplace transform of cosine integral (2 January 2015)

References[edit]

$\ast$-integral functions