Question
यदि $f(x) = \left\{ \begin{array}{l}\frac{{{x^2} - 1}}{{x + 1}},\,{\rm{when \,\,}}x \ne - 1\\\,\,\,\,\,\,\,\, - 2,\,{\rm{when\,\, }}x = - 1\end{array} \right.,$ तो
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$c = \cos \gamma + i\,\sin \gamma $ तथा $\frac{b}{c} + \frac{c}{a} + \frac{a}{b} = 1,$ तब $\cos (\beta - \gamma ) + \cos (\gamma - \alpha ) + \cos (\alpha - \beta )$का मान होगा
को संतुष्ट करने वाले फलनों
$\mathrm{f}:\{1,2,3,4\} \rightarrow\{\mathrm{a} \in \mathbb{Z}|\mathrm{a}| \leq 8\}$
की संख्या है -