Note 1 to entry: For the quantity ${\displaystyle a(t)=\widehat{A}\text{cos}(\omega t+{\vartheta }_0)}$, the initial phase is ${\displaystyle {\vartheta }_0}$.

Note 1 à l'article: Pour la grandeur ${\displaystyle a(t)=\widehat{A}\text{cos}(\omega t+{\vartheta }_0)}$, la phase à l'origine est ${\displaystyle {\vartheta }_0}$.