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$cos (v + 9 0^{\circ}) = - sin (v)$

Eftersom sinus och cosinus kan ses som förskjutningar av varandra kan man skriva sinusfunktioner som cosinusfunktioner och vice versa med hjälp av olika samband. Ett sådant samband är $cos (v + 9 0^{\circ}) = - sin (v) .$

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