Chapter 4: Problem 6
Give an example of a limit of the form \(\infty / \infty\) as \(x \rightarrow 0\).
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Chapter 4: Problem 6
Give an example of a limit of the form \(\infty / \infty\) as \(x \rightarrow 0\).
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The theory of interference of coherent oscillators requires the limit \(\lim _{\delta \rightarrow 2 m \pi} \frac{\sin ^{2}(N \delta / 2)}{\sin ^{2}(\delta / 2)},\) where \(N\) is a positive integer and \(m\) is any integer. Show that the value of this limit is \(N^{2}\).
Consider the general cubic polynomial \(f(x)=x^{3}+a x^{2}+b x+c,\) where \(a, b,\) and \(c\) are real numbers. a. Prove that \(f\) has exactly one local maximum and one local minimum provided that \(a^{2}>3 b\) b. Prove that \(f\) has no extreme values if \(a^{2}<3 b\)
Locate the critical points of the following functions and use the Second Derivative Test to determine whether they correspond to local maxima, local minima, or neither. $$h(x)=(x+a)^{4}, a \text { constant }$$
Consider the functions \(f(x)=\frac{1}{x^{2 n}+1},\) where \(n\) is a positive integer. a. Show that these functions are even. b. Show that the graphs of these functions intersect at the points \(\left(\pm 1, \frac{1}{2}\right),\) for all positive values of \(n\) c. Show that the inflection points of these functions occur at \(x=\pm \sqrt[2 n]{\frac{2 n-1}{2 n+1}},\) for all positive values of \(n\) d. Use a graphing utility to verify your conclusions. e. Describe how the inflection points and the shape of the graphs change as \(n\) increases.
Find the function \(F\) that satisfies the following differential equations and initial conditions. $$F^{\prime \prime}(x)=\cos x, F^{\prime}(0)=3, F(\pi)=4$$
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