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A biquadratic equation, also known as a quartic equation, is a polynomial equation of degree four. It has the following structure: ax^4 + bx^2 + c = 0, where a, b, and c are constants and a is different from zero. It is called "biquadratic" because the variable x appears raised to the power of 4 and also to the power of 2. To solve a biquadratic equation, you can use the substitution method and the resolvent formula.
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