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14:58
YouTube
The Learning Studio
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.com/textbooks/
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