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Trigonometri

Trigonometri handlar om sambanden mellan en triangels vinklar och sidlängder. Ordet är en sammanslagning av de grekiska orden "trigonon" och "métron" som betyder "tre vinklar" respektive "mått". Med de trigonometriska funktionerna sinus, cosinus och tangens kan man bestämma en rätvinklig triangels sidor eller vinklar. I godtyckliga trianglar kan man använda triangelsatserna för att bestämma sidor, vinklar och area.

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