Question
फलन $y = a(1 - \cos x)$ उच्चिष्ठ है, जब $x = $
==> $y' = 0 \Rightarrow \sin x = 0$ ==> $x = 0,\,\pi $
$y'' = a\cos x$ ==> $y''(0) = a$ तथा $y''(\pi ) = - a$
इस प्रकार $y$ अधिकतम है, जब $x = \pi $.
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