माना \( f: R^{+} \rightarrow R \) इस प्रकार परिभाषित है कि \( f(x)=\log _{e} x \). निम्नलिखित प्...

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माना \( f: R^{+} \rightarrow R \) इस प्रकार परिभाषित है कि \( f(x)=\log _{e} x \). निम्नलिखित प्रत्येक को ज्ञात कीजिएक्या \( f(x y)=f(x)+f(y) \) सत्य है?
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