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The equation of the FM signal is 10 sin [2 π × 106 t +5 sin ( 2 π × 103 t )]. The modulating frequency is _____.

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The equation of the FM signal is  10 sin [2 π ×  10<sup>6 </sup>t +5 sin ( 2 π × 10<sup>3 </sup>t )]. The modulating frequency is  _____.






 
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