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  4. If 0< θ< 360°, then solutions of cos θ=-1 / 2 are

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Q. If $0< \theta< 360^{\circ}$, then solutions of $\cos \,\theta=-1 / 2$ are

Trigonometric Functions

Solution:

$\cos \,\theta=-1 / 2=\cos 120^{\circ}$ or $\cos\, 240^{\circ} \,\,\,\,\,,\left[0<\theta<360^{\circ}\right]$
$\therefore \theta=120^{\circ}, 240^{\circ}$