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elem. trigonometrice

studiaza unghiuri

TermDefinition
Funcțiile trigonometrice: Într-un triunghi dreptunghic ABC cu unghiul BAC de 90 gr, notăm măsurile laturilor astfel: ipotenuza BC = a ; cateta AB = c ; cateta AC = b. Pentru unul dintre unghiurile ascuțite ale triunghiului ABC, fie acesta unghiul ABC de măsură x grade.
Funcția SINUS a unghiului ABC: Se notează sin ABC sau sin B în locul unghiului putem pune măsura x a acestuia și avem sin x funcția sin x se calculează prin raportul dintre cateta opusă unghiului x și ipotenuză.
Funcția COSINUS a unghiului ABC: Se notează cu cos ABC sau cos B sau cos x. Funcția cos x se calculează prin raportul dintre cateta alăturată unghiului x și ipotenuză.
Funcția TANGENTĂ a unghiului ABC: Se notează cu tg ABC, sau tg B sau tg x. Funcția tangentă se calculează prin raportul dintre cateta opusă unghiului și cateta alăturată unghiului.
Created by: diddi
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