Question
यदि $\pi \le x \le 2\pi $, तब ${\cos ^{ - 1}}(\cos x) $ बराबर है
$ \Rightarrow \,\, - \pi \ge - x \ge - 2\pi \,\,\, \Rightarrow \,\,\pi \ge 2\pi - x \ge 0$
$ \Rightarrow \,\,{\cos ^{ - 1}}\,\left\{ {\cos \,(2\pi - x)} \right\} = 2\pi - x$.
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