12.2 Trigonometric Functions

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The following three plots illustrate derived formulas for $\cos(y)$,  $\sin(y)$, and $sinc(y)=\frac{\sin(y)}{y}$ (orange curves) converge to the reference functions provided by the Wolfram Language (blue curves) for $y\in\mathbb{R}$.

$\cos(y)$
$\sin(y)$
$sinc(y)=\frac{\sin(y)}{y}$