Values of θ (0 < θ < {360^o}) satisfying {rm{cosec}}θ + 2 = 0 are

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Trigonometrical Equations

easy

Values of $\theta (0 < \theta < {360^o})$ satisfying ${\rm{cosec}}\theta + 2 = 0$ are

A

${210^o},{300^o}$

B

${240^o},{300^o}$

C

${210^o},{240^o}$

D

${210^o},{330^o}$

Solution

(d) ${\rm{cosec }}\theta + 2 = 0$

$ \Rightarrow $ $\sin \theta = – \frac{1}{2}$

$ \Rightarrow $ $\theta = 210^\circ $ or $330^\circ $.

Standard 11

Mathematics

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