NCERT Example 13.2 - Oscillations

Question: Which of the following are periodic? (a) sin ?t + cos ?t, (b) sin�?t, (c) e^(??t), (d) log(?t).

Answer: (a) **Periodic, T = 2?/?**; (b) **periodic, T = ?/?**; (c) **not periodic**; (d) **not periodic**.

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