Question
यदि $f(x) = \log \frac{{1 + x}}{{1 - x}}$, तब $f(x)$ है
तथा $f( - x) = \log \left( {\frac{{1 - x}}{{1 + x}}} \right) = \log {\left( {\frac{{1 + x}}{{1 - x}}} \right)^{ - 1}}$
$ = - \log \left( {\frac{{1 + x}}{{1 - x}}} \right) = - f(x)$ ==> $f(x)$ एक विषम फलन है।
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तब $1 + ab + {a^2}{b^2} + ..........\infty $ का मान होगा