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(e) \( \lim _{x \rightarrow \infty} \frac{5 x^{2}-3 x+2}{3 x^{2}-1} \)

Ask by Norris Mcguire. in the United States
Jan 24,2025

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The limit is \( \frac{5}{3} \).

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The Deep Dive

To analyze the limit \( \lim _{x \rightarrow \infty} \frac{5 x^{2}-3 x+2}{3 x^{2}-1} \), we can focus on the leading terms in the numerator and the denominator since they will dominate the behavior as \( x \) approaches infinity. The leading term in the numerator is \( 5x^2 \) and in the denominator is \( 3x^2 \). Thus, we can simplify the limit as follows: \[ \lim _{x \rightarrow \infty} \frac{5 x^{2}-3 x+2}{3 x^{2}-1} = \lim _{x \rightarrow \infty} \frac{5 x^{2}}{3 x^{2}} = \frac{5}{3}. \] Thus, the limit is \( \frac{5}{3} \).

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Find \( \lim _{x \rightarrow 0^{+}}\left(e^{-1 / x} \sin (1 / x)-(x+2)^{3}\right) \) (if it exists) and give a careful argument showing that your answer is correct. The notation lim the uniqueness of limits. Prove that limits, if they exist, are indeed unique. That is, the suppose that \( f \) is a real valued function of a real variable, \( a \) is an accumulation point of the domain of \( f \), and \( \ell, m \in \mathbb{R} \). Prove that if \( f(x) \rightarrow \ell \) as \( x \rightarrow a \) and \( f(x) \rightarrow m \) as \( x \rightarrow a \), then \( l=m \). (Explain carefully why it was important that we require \( a \) to be an accumulation point of the domain of \( f \).) Let \( f(x)=\frac{\sin \pi x}{x+1} \) for all \( x \neq-1 \). The following information is known about a function \( g \) defined for all real numbers \( x \neq 1 \) : (i) \( g=\frac{p}{q} \) where \( p(x)=a x^{2}+b x+c \) and \( q(x)=d x+e \) for some constants \( a, b, c, d, e \); (ii) the only \( x \)-intercept of the curve \( y=g(x) \) occurs at the origin; (iii) \( g(x) \geq 0 \) on the interval \( [0,1) \) and is negative elsewhere on its domain; (iv) \( g \) has a vertical asymptote at \( x=1 \); and (v) \( g(1 / 2)=3 \). Either find lim \( g(x) f(x) \) or else show that this limit does not exist. Hints. Write an explicit formula for \( g \) by determining the constants \( a \ldots e \). Use (ii) to find \( c \); use (ii) and (iii) to find \( a \); use (iv) to find a relationship between \( d \) and \( e \); then use (v) to obtain an explicit form for \( g \). Finally look at \( f(x) g(x) \); replace sin \( \pi x \) by sin( \( (x(x-1)+\pi) \) and use the formula for the sine of the sum of two numbers.
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