sin(α+β)=sinαcosβ+cosαsinβ
sin(30°+β)=sin30°cosβ+cos30°sinβ= · + · = +=
Z jedynki trygonometrycznej:
cosβ=
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sin(α+β)=sinαcosβ+cosαsinβ
sin(30°+β)=sin30°cosβ+cos30°sinβ= · + · = +=
Z jedynki trygonometrycznej:
cosβ=