biquadratic equation

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Noun1.biquadratic equation - an equation of the fourth degree
equation - a mathematical statement that two expressions are equal
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After that a biquadratic equation is received to determine the cross-section [x.sub.0]:
After generation of the determinant of the natural frequencies matrix for system (13) it is possible to write the following characteristic biquadratic equation for system (13) of Lagrange equations (G.6), (G.12), and (G.18) in the form: