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cot 60°
= 1/ tan 60°
= cos 60° / sin 60°
= 1/2 / (√3 / 2)
= 1 / √3 (dikalikan dgn akar penyebut, yaitu √3 / √3)
= √3 / 3
b)
cot 120°
= 1/ tan 120°
= cos 120° / sin 120°
= cos (180°-60°) / sin (180°-60°)
= - cos 60° / sin 60°
= - 1/2 / (√3 / 2)
= - 1 / √3
= - √3 / 3
atau
cot 120°
= cot (180°-60°)
= - cot 60°
= - √3 / 3