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Finding determinants by cofactor expansion

In this video, we learn how to find the determinant of a matrix using the Cofactor Expansion method in a clear and step-by-step way. Cofactor expansion is one of the most important techniques in Linear Algebra, especially for calculating determinants of 3×3 matrices. In this tutorial, we carefully expand along a row or column, compute minors and cofactors, and simplify the determinant correctly. 📌 In this video, you will learn: • What cofactor expansion is • How to choose a row or column for expansion • How to calculate minors and cofactors • Step-by-step determinant calculation of a 3×3 matrix • Common mistakes and exam tips This lesson is perfect for school students, college students, engineering students, and competitive exam aspirants who want strong fundamentals in determinants. If you find this helpful, don’t forget to Like, Share, and Subscribe for more Linear Algebra tutorials! #LinearAlgebra #Determinants #CofactorExpansion #Matrix #EngineeringMath #Mathematics #MathTutorial #STEM #ExamPreparationsocial media links Twitter; https://x.com/PhysicProfessor Facebook; https://www.facebook.com/profile.php?... Instagram;   / leprofessoragui   Tiktok;   / le.professor.agui   Linkedin; www.linkedin.com/in/le-professor-agui-4a7840360 Reddit;   / leprofessoragui