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tgα = ?
Korzystam z 1 trygonometrycznej i obliczam cosα
cos²α + sin²α =1
cos²α = 1-sin²α
cos²α = 1- M²
cosα = √(1-M²)
Obliczam tgα
tgα = sinα : cosα
tgα = M : √(1-M²)
tgα =[ M : √(1-M²)]*[(√(1-M²):√(1-M²)] usuwam niewymierność mianownika
tgα =[ M(√(1-M²)]: (1-M²)