solve the interval [0,2p1) : 1+cosTheta=1/2

please help!
in Trigonometry Answers by Level 1 User (120 points)

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1 Answer

thats same as kosine(x)=-0.5

kosine(60 deg)=+0.5, kosine(90)=0, kosine(180)=-1

Kerv be symmetrik so kosine=-0.5 at angel=(180-60)=120 deg
by

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