# complex analysis homework help

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• Q1:(3) Define g(z) - Inr+i0 <0<T. where z=rei and r>0 and (i) Sketch the domain D of the function g(z) and show that g(z) is analytic on this domain and find g'(z). (ii) Show that the composite function G(z) = g(2²+1) is analytic on the half-plane H = {z=z+iy : x>0}, with derivative 2z 2² +1 G(z)= (4) (i) Define what it means for a subset of C to be open. (ii) Define what it means for a subset of C to be a domain. (iii) Suppose f(2)= u(x, y) +iu(x, y), z=1+iy, x,y ER, for z in a domain D. Prove that if f is analytic on this domain D then f'(2)=0 for all z in D, and hence f is constant on D.See Answer
• Q2: A random sample of 15 college students were asked "How many hours per week typically do you work outside the home? Their responses are shown on the right.11 Determine the shape of the distribution of hours worked by drawing a frequency histogram and computing the mean and median.Which measure of central tendency better describes hours worked? See Answer
• Q3: Show how to use the "slide method" to determine the GCF and LCM of 3250 and 4000.See Answer
• Q4: 2. Let varphi be the following sentence in a first-order language with one one-place function symbol f: \varphi=((\forall x \exists y(x=f y)) \wedge(\forall x \forall y(f x=f y \rightarrow x=y))) (i) Give a short explanation of what it means for a structure to satisfy the sentence varphi above. (ii) Show that there are types of countable structures which satisfy p.uncountably many different isomorphism (iii) For each n > 0, let psin be the sentence \forall x(\neg(x=\underbrace{f \cdots f}_{n \text { times }} x)) Show that there are only countably many different isomorphism types of countable structures which satisfy both varphi and psin for all n > 0.See Answer
• Q6: (a) Determine which of the following maps are linear (giving reasons for your answers). f: R_{3}-\rightarrow R_{2} \quad\left[x_{1, X 2, X 3}\right\} 7-\rightarrow[x 2+1, x 3-1\} f: \mathrm{R} 3-\rightarrow \mathrm{R} \quad[x 1, X 2, X 3\} 7-\rightarrow X 1 \times 2 \times 3 f: \mathrm{R} 3-\rightarrow \mathrm{R} 3 \quad[X 1, X 2, X 3\} 7-\rightarrow[X 1+X 2+2 X 3,0, X 2\}See Answer
• Q7: For which value of a > 0 the functions f(t) =t and f(t) 1 areorthogonalon the interval [-a, a] ? a. 1 b. 3 c. all of the others d. 4 e. 2See Answer
• Q8: a) Confirm that the function f(t) = 3t is an odd fuction (show all your work). b) Find the Fourier sine series of the function f(t) = 3ton the interval [-7, 7].See Answer
• Q9: \text { The function } \sin (2 x) \text { is an even function on the interval }[-\pi, \pi] \text { . } True FalseSee Answer
• Q10: \text { What is the Fourier transform of the function } 4 \cos (5 t) \text { on the interval }[-\pi, \pi] ? \text { a. } \cos (2 t)+\cos (4 t) b. none of the others c. 2 cos (t) +7 sin(2t) d. 4 cos(5t) 7 sin(2t) + 4 cos(5t)e.See Answer
• Q11: \text { or the continuous odd function } f(t) \text { if } \int_{0}^{a} f(t) d t=4, a>0 \text { , then } \int_{-a}^{a} f(t) d t=? a. 4 b. all of the others c. 2 d. 8 e. OSee Answer
• Q12: The functions f(t) = 1 and f(t)t are orthogonal on the interval [-1,1]. O True O FalseSee Answer
• Q13: \text { What is the Fourier transform of the function } 2 \sin (3 t) \text { on the interval }[-\pi, \pi] \text { ? } \text { a. } \sin (t)+\sin (2 t) \text { b. } 3 \sin (2 t)+4 \sin (3 t) \text { c. } 2 \sin (3 t) \text { d. } 4 \sin (t)+2 \sin (2 t) e. none of the othersSee Answer
• Q14: Using (13) sketch or graph a figure (similar to Fig. 291 in Sec. 12.3) of the deflection u(x, t) of a vibrating string(length L = 1, ends fixed, c = 1) starting with initial velocity 0 and initial deflection (k small, say, k = 0.01). \text { 7. } f(x)=k \sin 2 \pi x See Answer
• Q15: Find all trigonometric functions of the acute angle 0 in the right triangle below: See Answer
• Q16: \text { What is the fundamental period of the function } f(t)=\cos (3 t) ? \text { a. } \frac{2 \pi}{3} b. none of the others \text { c. } \frac{\pi}{2} \text { d. } 4 \pi \text { e. } 8 \piSee Answer
• Q17: . Consider the eigenvalue problem y^{\prime \prime}+\lambda y=0 ; \quad y^{\prime}(0)=0, \quad y(\pi)=0 .See Answer
• Q18: Compute the product using (a) the definition where Ax is the linear combination of the columns of A using the corresponding entries in x as weights, and (b) the row-vector rule for computing Ax. If a product is undefined, explain why. (a) Compute the product using the definition where Ax is the linear combination of the columns of A using the corresponding entries in x as weights. If the product sun defined, explain why. Select the correct choice below and, if necessary, fill in any answer boxes to complete your choice. Ах- B. The matrix-vector Ax is not defined because the number of rows in matrix A does not match the number of entries in the vector x. The matrix-vector Ax is not defined because the number of columns in matrix A does not match the number of entries in the vector x.See Answer
• Q19: O Find the values of x for which the following functions have stationary values and using your results, sketch a graph of each function.bed tomoidelngog oIT y=e^{2 x}-2 x y=4 e^{x}-2 x-3See Answer
• Q20: A nonlinear dynamic system is described by the following three state variable equations: \dot{q}_{1}=q_{2}-q_{3} \dot{q}_{2}=u+q_{2}+\frac{1}{2}\left|q_{1}\right| q_{1} \dot{q}_{3}=3 q_{1}+6 q_{3} Assume that 73 = 2. What is the value of 71?See Answer

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