Fresnel C

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The Fresnel C function is defined by the formula $$C(x)=\int_0^x \cos(t^2) dt.$$

Properties

Theorem: The following limit is known: $$\displaystyle\lim_{x \rightarrow \infty} C(x) = \displaystyle\int_0^{\infty} \cos(t^2)dt = \sqrt{ \dfrac{\pi}{8}}.$$

Proof:

Videos

How to integrate cos(x^2) - The Fresnel Integral C(x)

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