12th Maths, Exercise:2.8 - 4th sum has been explained
CHAPTER 2 – Complex Numbers
2.1 Introduction to Complex Numbers
2.2 Complex Numbers
2.3 Basic Algebraic Properties of Complex Numbers
2.4 Conjugate of a Complex Number
2.5 Modulus of a Complex Number
2.6 Geometry and Locus of Complex Numbers
2.7 Polar and Euler form of a Complex Number
2.8 de Moivre’s Theorem and its Applications
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