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5.8.7 The cosine integral function: Ci

The cosine integral function is defined by

     
  Ci(x)
= 
x


+∞
cos(t)
t
dt
         
 
 =ln(t) + γ + 
x


t=0
cos(t) − 1
t
dt
         

and Ci(0) = −∞, Ci(−∞) = iπ and Ci(+∞) = 0.

The Ci command computes the cosine integral function.

Examples


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