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Choose the function $f(t); – \infty < 1 < \infty,$ for which a Fourier series cannot be defined.

  1. $3 \sin (25 t)$
  2. $4 \cos (20 t+3)+2 \sin (710 t)$
  3. $\exp (-|t|) \sin (25 t)$
  4. $1$
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