The equation of an FM signal is $e=6 \sin \left(10^{6} t+4 \sin 10^{3} t\right)$. Then, the modulating frequency is —

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The equation of an FM signal is $e=6 \sin \left(10^{6} t+4 \sin 10^{3} t\right)$. Then, the modulating frequency is —

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