The relations between acceleration and displacement of four particles are given below. Which one of the particles is executing simple harmonic motion?
| 1. | \(a_1 = +2x\) | 2. | \(a_1= +2x^2\) |
| 3. | \(a_1= -2x^2\) | 4. | \(a_1 = -2x\) |
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