What is the value of \text{cosec}(-\frac{73\pi}{3})?

  1. A. \frac{2}{\sqrt{3}}
  2. B. -\frac{2}{\sqrt{3}}
  3. C. 2
  4. D. -2

Correct Answer: B. -\frac{2}{\sqrt{3}}

Explanation

\text{cosec}(-\frac{73\pi}{3}) = -\text{cosec}(\frac{73\pi}{3}) = -\text{cosec}(24\pi + \frac{\pi}{3}). Since sine is periodic with 2\pi, this evaluates to -\text{cosec}(\frac{\pi}{3}) = -\frac{2}{\sqrt{3}}.

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