Question
$\cos \theta + \sin \theta $ का निम्निष्ठ मान है
चूँकि $ - 1 \le \cos \left( {\theta - \frac{\pi }{4}} \right) \le 1$
$\Rightarrow$ $ - \sqrt 2 \le \sqrt 2 \cos \left( {\theta - \frac{\pi }{4}} \right) \le \sqrt 2 $
अत: $f(x)$ का न्यूनतम मान $ - \sqrt 2 $ है।
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$\tan ^{-1}(\sqrt{\frac{1-\cos x}{1+\cos x}}), x<\pi$