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2. Complex numbers in trigonometric form
Many applications of complex numbers, particularly in electricity, are based on the fact that multiplication by "j" can be interpreted as a rotation of a right angle; this leads us to define another way of marking complexes than the Cartesian one.
2.1 Modulus and argument of a complex number
Given a non-zero complex number z with image M, we call (figure 4 ) :
modulus of z is the distance OM; it is noted
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Complex numbers in trigonometric form
Moivre and Euler formulas
