Khan Academy Passage question- ECG + Fourier Transform

[Jiller1994]

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I am enjoying this Khan Academy stuff but holy fish paste this question makes 0.000% sense to me.

Question talks about how you can transform a function with two sine graphs using fourier transform to an ECG-like reading on question 3 of the passage. You should be able to see it here:
https://www.khanacademy.org/test-pr...e/analyzing-electrocardiogram-voltage-signals

How do I tackle this kind of problem??

 

[amir91]

I dont think we should pay too much attention to problems beside AAMC.