QUESTION IMAGE
Question
find the limit.
- $lim_{x
ightarrow(-2)^-}\frac{1}{x + 2}$
- $lim_{x
ightarrow(-2)^+}\frac{1}{x + 2}$
- $lim_{x
ightarrow - 2}\frac{1}{x + 2}$
- $lim_{x
ightarrow0}\frac{1}{x^{2/3}}$
- $lim_{x
ightarrow(pi/2)^+}\tan x$
- $lim_{x
ightarrow(-pi/2)^-}sec x$
- $lim_{x
ightarrow0^+}(1+csc x)$
- $lim_{x
ightarrow0}(1 - cot x)$
61)
Step1: Analyze left - hand limit
As \(x\to(- 2)^{-}\), let \(x=-2 - h\) where \(h\to0^{+}\). Then \(\frac{1}{x + 2}=\frac{1}{-2 - h+2}=-\frac{1}{h}\). As \(h\to0^{+}\), \(\lim_{x\to(-2)^{-}}\frac{1}{x + 2}=-\infty\).
62)
Step1: Analyze right - hand limit
As \(x\to(-2)^{+}\), let \(x=-2 + h\) where \(h\to0^{+}\). Then \(\frac{1}{x + 2}=\frac{1}{-2 + h+2}=\frac{1}{h}\). As \(h\to0^{+}\), \(\lim_{x\to(-2)^{+}}\frac{1}{x + 2}=\infty\).
63)
Step1: Check one - sided limits
Since \(\lim_{x\to(-2)^{-}}\frac{1}{x + 2}=-\infty\) and \(\lim_{x\to(-2)^{+}}\frac{1}{x + 2}=\infty\), the two - sided limit \(\lim_{x\to - 2}\frac{1}{x + 2}\) does not exist.
64)
Step1: Analyze limit as \(x\to0\)
As \(x\to0\), if \(x\to0^{+}\), \(\frac{1}{x^{2/3}}=\frac{1}{\sqrt[3]{x^{2}}}\to+\infty\), and if \(x\to0^{-}\), \(\frac{1}{x^{2/3}}=\frac{1}{\sqrt[3]{x^{2}}}\to+\infty\). So \(\lim_{x\to0}\frac{1}{x^{2/3}}=\infty\).
65)
Step1: Recall tangent function
\(\tan x=\frac{\sin x}{\cos x}\). As \(x\to(\frac{\pi}{2})^{+}\), \(\cos x\to0^{-}\) and \(\sin x\to1\). So \(\lim_{x\to(\frac{\pi}{2})^{+}}\tan x=-\infty\).
66)
Step1: Recall secant function
\(\sec x=\frac{1}{\cos x}\). As \(x\to(-\frac{\pi}{2})^{-}\), \(\cos x\to0^{-}\). So \(\lim_{x\to(-\frac{\pi}{2})^{-}}\sec x=-\infty\).
67)
Step1: Recall cosecant function
\(\csc x=\frac{1}{\sin x}\). As \(x\to0^{+}\), \(\sin x\to0^{+}\), so \(\csc x\to+\infty\). Then \(\lim_{x\to0^{+}}(1 + \csc x)=\infty\).
68)
Step1: Recall cotangent function
\(\cot x=\frac{\cos x}{\sin x}\). As \(x\to0\), \(\lim_{x\to0}\cos x = 1\) and \(\lim_{x\to0}\sin x=0\). \(\lim_{x\to0}\cot x=\infty\), so \(\lim_{x\to0}(1-\cot x)=-\infty\).
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