calculate the exact value of the following without using a calculator: cot 150 degree

cot 150 degrees
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2 Answers

kotan=1/tangent=kosine/sine

150 deg=90+60 become 180-30

x part=negativ & y part positiv, so yu hav sine(-30)deg...-sine(30)=-0.5

kosine(-30)=kosine(30)=sqrt(3)/2...0.8660254037844386
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cot150=1/tan(150)=1/tan(180-30)=-1/tan30=-sqrt(3).
by Top Rated User (1.2m points)

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