If cos x=-1/2,x lies in third quadrant.
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cos x=-1/2 lies in second quadrant
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Cos x=-1/2
Cos x= -cos 60°
x=60°
As, cos (-a)= cos (a)
Cos 60 °= 1/2
Cos (180°-60°])=cos120°=-cos60° =-1/2 {it lies inthird quadrant}
Hope it helps
:)
Cos x= -cos 60°
x=60°
As, cos (-a)= cos (a)
Cos 60 °= 1/2
Cos (180°-60°])=cos120°=-cos60° =-1/2 {it lies inthird quadrant}
Hope it helps
:)
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