Mathematik (Subject) / Trigonometrie (Lesson)
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- Komplementformel sin α= cos (90°-α) cos α= sin (90°-α)
- Trigonometrischer Pythagoras (sin α)2+(cos α)2= 1
- Tangens-Formel tan α= sin α : cos α
- Tangens tan α= a:b tan β= b:a
- Sinus sin α= a:c sin β= b:c
- Kosinus cos α= b:c cos β= a:c