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complex conjugate x+ yi:= x yi (negate the imaginary component) One can add, subtract, multiply, and divide complex numbers (except for division by 0). Addition, subtraction, and multiplication are as for polynomials, except that after multiplication one should simplify by using i2 = 1; for example, (2 + 3i)(1 5i) = 2 7i 15i2 = 17 7i:
1. Chapter 1 The Complex Plane. Introduction to MAT334. We start a class called “Complex Variables” but more precisely it should be called Functions of a Complex Variable and even more precisely Functions of One Complex Variable.
• understand how quadratic equations lead to complex numbers and how to plot complex numbers on an Argand diagram; • be able to relate graphs of polynomials to complex numbers; • be able to do basic arithmetic operations on complex numbers of the form a +ib; • understand the polar form []r,θ of a complex number and its algebra;
Complex numbers - Exercises with detailed solutions 1. Compute real and imaginary part of z = i¡4 2i¡3: 2. Compute the absolute value and the conjugate of z = (1+ i)6; w = i17: 3. Write in the \algebraic" form (a+ib) the following complex numbers z = i5 +i+1; w = (3+3i)8: 4. Write in the \trigonometric" form (‰(cosµ +isinµ)) the following ...
This article discusses some introductory ideas associated with complex numbers, their algebra and geometry. This includes a look at their importance in solving polynomial equations, how complex numbers add and multiply, and how they can be represented. Finally we look at the nth roots of unity, that is, the solutions of the equations zn = 1.
The complex number z is given by z = eiθ, − < ≤π θ π . a) Show clearly that 1 n 2cos n z n z + ≡ θ. b) Hence show further that 16cos cos5 5cos3 10cos5θ θ θ θ≡ + + . c) Use the results of part (a) and (b) to solve the equation cos5 5cos3 6cos 0θ θ θ+ + = , 0 ≤ <θ π . 3, , 4 2 4 π π π θ=
7 Οκτ 2012 · Complex number geometry Problem (AIME 2000/9.) A function f is de ned on the complex numbers by f (z) = (a + b{_)z, where a and b are positive numbers. This function has the property that the image of each point in the complex plane is equidistant from that point and the origin. Given that ja + b{_j= 8 and that b2 = m=n, where
