SOH CAH TOA : sin=Opp/Hypo, cos=Adj/Hypo, tan=Opp/Adj ; puis csc/sec/cot sont les inverses.
1. Dans un triangle rectangle, quel rapport trigonométrique correspond à sinus d’un angle ?
2. Quelle égalité relie correctement la tangente aux fonctions sinus et cosinus ?
3. Quelle est la dérivée de la fonction tangente ?
Rapports SOH CAH TOA
sin=opp/hypo, cos=adj/hypo, tan=opp/adj
Identités fondamentales
sin²+cos²=1 et 1+tan²=sec²
Dérivée de tan
tan’(teta)=sec²(teta)
Substitution racine a²−x²
x=a*sin(teta)
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