1. Oblicz:
a) tg23° * tg67°
b) sin²16°+ cos²16°
Zastosuj wzór
tg x =tg(90^o-x)=ctgx
oraz wzór:
tg x * ctg x=1
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Zastosuj wzór
tg x =tg(90^o-x)=ctgx
oraz wzór:
tg x * ctg x=1