Przedstaw w prostszej postaci:
1 - sin²α
sinα cosα
cos²α cosα
= -------- = ----------- = ctgα
sinα * cosα sinα
1 - sin²α cos²α cosα
------------ = ------------------ = ------------ = ctgα
sinα·cosα sinα·cosα sinα
jedynka trygonometryczna: sin²α + cos²α = 1
cos²α = 1 -sin²α
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cos²α cosα
= -------- = ----------- = ctgα
sinα * cosα sinα
1 - sin²α cos²α cosα
------------ = ------------------ = ------------ = ctgα
sinα·cosα sinα·cosα sinα
jedynka trygonometryczna: sin²α + cos²α = 1
cos²α = 1 -sin²α