Ci
The cosine integral.
Syntax

Ci(x)

x
is a real number

Description
Ci(x)
is the cosine integral of x
, defined as the integral of −cos(t)/t
from t = x
to ∞
.
Examples
Ci(1)
0.337403922901
The cosine integral.
Ci(x)
x
is a real number
Ci(x)
is the cosine integral of x
, defined as the integral of −cos(t)/t
from t = x
to ∞
.
Ci(1)
0.337403922901