21.2.3. Are the angles? 1 and? 2 deviation mathematical pendulums from their vertical position of the main coordinates of the oscillations of the system? The pendulums are interconnected by a spring and perform small oscillations in the vertical plane.

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(DYNAMICS, Chapter 21 - Small oscillations of mechanical systems, par - 21.2: The vibrations of systems with two degrees of freedom) from Reshebnik to the collection of short tasks on the theoretical mechanics Kep OE, JA Viba, OP Grapis, JA Svetinysh et al. Publishing Moscow / Graduate School / 1989, 2009, 2012.
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