Calculus Michael Spivak 3th Edition Pag 42 Rational Function

In summary, the text on page 42 discusses examples of functions that are not rational functions, but are part of a larger class of functions. This is shown through the equations p = x + x² + x*sin²x and q = x*sin x + x*sin²x, which are not polynomial functions. This may seem inconsistent, but it is not a mistake in the book. The text clarifies that these are not rational functions and this is further emphasized by the conversation between the two individuals.
  • #1
xorg
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Pag 42 says:

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Seems inconsistent.
in (9):
p = x +x²+x.sin²x
q = x.sin x + x.sin²x
But by definition p and q are not polynomial functions.

It is a mistake in the book?
 
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  • #2
Ah but did it say these were rational functions ? Read again : )
 
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  • #3
wabbit said:
Ah but did it say these were rational functions ? Read again : )
You are right. Misinterpreted.
Thank you.
 
  • #4
For those who don't quite get it- and it took me a moment- the text says "The rational functions are quite special examples of an even larger class of functions". The examples given are examples of that "even larger class of functions" that includes the rational functions but are not rational functions themselves.
 
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1. What is a rational function?

A rational function is a mathematical function that can be expressed as the ratio of two polynomial functions. It is written in the form f(x) = p(x)/q(x), where p(x) and q(x) are polynomial functions and q(x) is not equal to 0.

2. How do you graph a rational function?

To graph a rational function, first find the asymptotes by setting the denominator equal to 0 and solving for x. Then, plot these asymptotes on the graph. Next, find the x and y-intercepts by setting the numerator equal to 0 and solving for x. Finally, plot these points and any other points needed to complete the graph.

3. What is a vertical asymptote?

A vertical asymptote is a vertical line on the graph of a rational function where the function approaches positive or negative infinity. It occurs at values of x where the denominator of the function is equal to 0.

4. How do you simplify a rational function?

To simplify a rational function, factor both the numerator and denominator and then cancel out any common factors. This will result in a simplified form of the function that is easier to work with.

5. How is calculus used to study rational functions?

Calculus is used to study rational functions by analyzing their derivatives and integrals. The derivative of a rational function can provide information about the slope and concavity of the function, while the integral can be used to find the area under the curve. Additionally, calculus techniques such as finding limits and using the intermediate value theorem can be used to solve problems involving rational functions.

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