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GATE ECE 2008 | Question-70

The signal $\cos \omega_{c} t+0.5 \cos \omega_{m} t \sin \omega_{c} t$ is

  1. $\mathrm{FM}$ only
  2. $\mathrm{AM}$ only
  3. both $\mathrm{AM}$ and $\mathrm{FM}$
  4. neither $\mathrm{AM}$ nor $\mathrm{FM}$
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