Why did Lagrange think that the use of trigonometric series to model a vibrating

Question

Why did Lagrange think that the use of trigonometric series to model a vibrating string was flawed?

1)None of these

2)He made this argument one night after drinking too much and recanted it the next day

3)Because he did not believe that it could that it could represent a discontinuity such as when one plucked the string
4)Because trig functions cannot represent smooth signals like sinusoids

5)Because trig functions cannot represent the harmonics that result from plucking a string
6) He just didn't like Fourier

Explanation / Answer

3)Because he did not believe that it could that it could represent a discontinuity such as when one plucked the string

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