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Cosinus av $v + 18 0^{\circ}$

Om man adderar ett halvt varv till argumentet för cosinus får man samma cosinusvärde fast negativt. Om man t.ex. beräknar cosinus av

2 3^{\circ} + 18 0^{\circ}

får man

Detta kan visas med hjälp av additionsformeln för cosinus.

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