MHB Calculating the limits without the L'Hospital rule

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Calculating the limits without using L'Hospital's rule can effectively be done through Taylor series expansions for functions like sine and exponential. For the limit involving sine, the Taylor series allows for simplification of the expression as x approaches zero. The squeeze theorem is also suggested as a potential method for evaluating these limits. Participants agree that while Taylor expansions are a straightforward approach, alternative methods like the squeeze theorem could be explored. Ultimately, the discussion emphasizes the utility of Taylor series in limit calculations.
mathmari
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Hey! :o

How could we calculate the following limits without the L'Hospital rule?

$$\lim_{x\rightarrow 0}\frac{\sin (x)-x+x^3}{x^3} \\ \lim_{x\rightarrow 0}\frac{e^x-\sin (x)-1}{x^2}$$

Is the only way using the Taylor expansion? (Wondering)
 
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mathmari said:
Hey! :o

How could we calculate the following limits without the L'Hospital rule?

$$\lim_{x\rightarrow 0}\frac{\sin (x)-x+x^3}{x^3} \\ \lim_{x\rightarrow 0}\frac{e^x-\sin (x)-1}{x^2}$$

Is the only way using the Taylor expansion? (Wondering)
It certainly looks as though they are expecting you to use the Taylor series expansions for the sine and exponential functions.
 
Ah ok... Couldn't we use for example the squeeze theorem? (Wondering)
 

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