Mathematical methods for engineers and scientists 1 complex - download pdf or read online

Mathematical methods for engineers and scientists 1 complex - download pdf or read online

By Kwong-Tin Tang

Pedagogical insights won via 30 years of training utilized arithmetic led the writer to jot down this set of pupil orientated books. themes corresponding to complicated research, matrix concept, vector and tensor research, Fourier research, indispensable transforms, usual and partial differential equations are provided in a discursive variety that's readable and simple to stick with. a variety of truly acknowledged, thoroughly labored out examples including conscientiously chosen challenge units with solutions are used to reinforce scholars' figuring out and manipulative ability. The target is to make scholars cozy and assured in utilizing complex mathematical instruments in junior, senior, and starting graduate courses.

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Example text

It follows that: z = (−64) 1/4 1/4 i(π+2kπ)/4 = (64) e , k = 0, 1, 2, 3, ⎧ √ 2 2(cos π4 + i sin π4 ) = 2 + 2i, ⎪ ⎪ ⎨ √ 3π 2√2(cos 3π 4 + i sin 4 ) = −2 + 2i, z= 5π ⎪ 2 2(cos 4 + i sin 5π ⎪ 4 ) = −2 − 2i, ⎩ √ 7π 2 2(cos 7π + i sin 4 4 ) = 2 − 2i, √ Note that the four roots are on a circle of radius 8 They are 90◦ apart. 6. 6. 3/2 k=0 k=1 k=2 k = 3. centered at the origin. √ π 2eiθ , θ = tan−1 (−1) = − . 4 √ i3θ+ik2π 3 (1 − i) = 2 2e , k = 0, 1, 2, . . √ 4 3/2 i(3θ/2+kπ) (1 − i) = 8e , k = 0, 1.

2 2 Thus zC − zA 3 =i . zD − zO 2 Since this is purely imaginary, therefore AC is perpendicular to OD. 1 Exponential and Trigonometric Functions of z The exponential function ez is of fundamental importance, not only for its own sake, but also as a basis for defining all the other elementary functions. The exponential function of real variable is well known. Now we wish to give meaning to ez when z = x + iy. In the spirit of Euler, we can work our way in a purely manipulative manner. Assuming that ez obeys all the familiar rules of the exponential function of a real number, we have ez = ex+iy = ex eiy = ex (cos y + i sin y) .

7. Find all values of ln 2. 7. The real number 2 is also the complex number 2 + i0, and n = 0, ±1, ±2, . . 693 + n2πi, n = 0, ±1, ±2, . . Even positive real numbers now have infinitely many logarithms. Only one of them is real, corresponding to n = 0 principal value. 8. Find all values of ln(−1). 8. ln (−1) = ln ei(π±2πn) = i (π + 2πn) , n = 0, ±1, ±2, . . The principal value is iπ for n = 0. Since ln a = x means ex = a, so long as the variable x is real, a is always positive. Thus, in the domain of real numbers, the logarithm of a negative number does not exist.

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