TRIGONOMETRY solves a CUBIC Equation

In this video, ‪@ArifSolvesIt‬ presents an example on how trigonometry is used to solve cubic equations with real roots. A comprehensive study which includes the formal derivation of the cubic formula, its applications, and the trigonometric substitution method, together with a brief overview of complex algebra (hence complex algebra is essential to manipulate the cubic formula) can be downloaded at the following link:   / how-to-solve-cubic-equations-8246   Should you choose not to support me on Patreon to download this study, please no worries! I will post a series of videos on YouTube detailing everything presented in this published study. Problem: Find the number of real roots of 8x^3-6x-1 and find the values of these roots. 00:00 Introduction 02:38 How to plot the given cubic polynomial function and determine the number of real roots? 10:45 Trigonometric Substitution method used to solve the given cubic equation. You can also follow me on other Social Media platforms:   / arifsolvesit     / arifsolvesit     / arifsolvesit