Browse Questions

# The value of $\theta(0 \;< \theta\;<360^{\circ})$ satisfying $cosec \;\theta-2=0$ are

$\begin{array}{1 1}(a)\;210^{\circ},300^{\circ}&(b)\;30^{\circ},150^{\circ}\\(c)\;210^{\circ},240^{\circ}&(d)\;210^{\circ},330^{\circ}\end{array}$

$cosec\; \theta-2=0$
$cosec \theta=2$
$\sin\theta=\large\frac{1}{2}$
$\theta=30^{\circ},150^{\circ}$
Hence (b) is the correct answer.