Posługując się wzorem:
tg (-α)= tgα oraz tg (270°+α)= -ctgα
Oblicz:
tg (-330°)
tg(-330°)=tg 330°= tg(270°+60°)=-ctg60°=
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tg(-330°)=tg 330°= tg(270°+60°)=-ctg60°=