How To ACTUALLY Solve a Cubic Equation using Trigonometry
This is a really nice method for solving cubic equations with three real roots! The method involves using the triple angle formula for cosine or sine and then solving a related trigonometric equation: all fairly elementary methods. Worked example: 8:45 Textbook available at https://thelearningstudioaustralia.co...
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TRIGONOMETRY solves a CUBIC Equation
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Solving a Cubic Equation Using a Triangle
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Pythagoras Would Be Proud: High School Students' New Proof of the Pythagorean Theorem [TRIGONOMETRY]
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A cubic formula that you probably haven't seen before!
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solving a cubic equation by completing the cube
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[Algebra] Derive the quartic formula
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Cardano's Formula for the Solutions of a Cubic Equation
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