Question
यादि $f(x) = \frac{{1 - x}}{{1 + x}},$ तब $f[f(\cos \;2\theta )] = $
$ = f({\tan ^2}\theta ) = \frac{{1 - {{\tan }^2}\theta }}{{1 + {{\tan }^2}\theta }} = \cos \,\,2\theta .$
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