NCERT Exercise 13.4 - Oscillations
Question: Which of the following functions of time represent (a) SHM and (b) periodic but not SHM? sin ?t ? cos ?t; sin�?t; 3 cos(?/4 ? 2?t); cos ?t + cos 3?t + cos 5?t.
Answer: SHM: **first and third**; periodic not SHM: **second and fourth**.
Full step-by-step NCERT solution with diagrams on Something by Zero.