Determine frequencies that is in the spectrum analyze, Electrical Engineering

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Two sine waves along with periods of 10 ms and 30 ms are added to generate a single waveform. A spectrum analyzer is utilized to examine the frequency contents of the waveform. What frequencies would you suppose to see in the spectrum analyzer?

I. 10Hz & 30Hz

II. 40Hz

III. 100Hz & 33.3Hz

IV. 133.3Hz

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