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COSINTEGRAL function

Description

COSINTEGRAL(x) returns the value of the cosine integral function of x. The cosine integral function is defined as:

Cosine integral function$$ {\rm Ci}(x) = \gamma + \ln x + \int_0^x\frac{\cos t-1}{t}\,dt $$

where γ = 0.57721566490153 (Euler-Mascheroni constant).

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CosIntegral(  

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CosIntegral function

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