Book:Murray R. Spiegel/Mathematical Handbook of Formulas and Tables/Chapter 35/Cosine Integral

Cosine Integral $\ds \map \Ci x = \int_x^\infty \frac {\cos u} u \rd u$

$35.14$: Characterization of Cosine Integral Function

$35.15$: Power Series Expansion for Cosine Integral Function plus Logarithm

$35.16$: Asymptotic Expansion for Cosine Integral Function

$35.17$: Limit to Infinity of Cosine Integral Function