Oblicz
ctg 390 stopni , ctg 660 stopni
ctg 390= ctg (390 - 360) = ctg30 = √3
ctg(660)=ctg(360+360-60)=ctg(360-60)=ctg(-60)=-ctg(60)= pierwiastek z 3 nad 3
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ctg 390= ctg (390 - 360) = ctg30 = √3
ctg(660)=ctg(360+360-60)=ctg(360-60)=ctg(-60)=-ctg(60)= pierwiastek z 3 nad 3