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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This gives a biquadratic equation for A, which we parametrise using (8).
28) is transformed to a biquadratic equation of y, namely
The equation of the torus generated by the tool corner radius can be expressed as a biquadratic equation in the unknown z (Coxeter, 1989):