18.2.1. To determine the relationship between the ability to move the points A and B of the straight rod AB, which form with the direction of the rod, respectively, the corners 30 and 60 °.

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(DYNAMICS, Chapter 18 - The principle of possible displacements, paragraph - 18.2: The possible displacement of the system) of 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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