3.23

\frac{x}{r} = \sin φ

${\frac{x}{r} = \sin \varphi}$

\frac{x}{r} = \sin φ

$\frac{x}{r} = \sin \varphi$

\frac{x}{r}

$\frac{x}{r}$

φ

$\varphi$

φ

$\varphi$

1

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