Fresnel S

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The Fresnel $S$ function is defined by $$S(x)=\int_0^x \sin(t^2) dt.$$

Properties

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

Proof:

$\ast$-integral functions