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DeepDifferentiation rules
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §2.4 The Derivative of the Sine and Cosine, #32 · Calculus · Differentiation rules

Give an example of oscillation that does not come from physics

Give an example of oscillation that does not come from physics. Is it simple harmonic motion (one frequency only)?

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §2.4 The Derivative of the Sine and Cosine, #32

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