If f(x) = sin(x^3) find f^(15)(0)

  • Thread starter Calcotron
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In summary, to find the 15th derivative of f(x) = sin(x^3), you can use the power series expansion for sin and read off the derivatives from the Taylor series expansion. This results in f(x) = x^3 - (x^9/ 3!) + (x^15/ 5!) and the 15th derivative being 15!/ 5!. This method is correct.
  • #1
Calcotron
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Short and sweet, If f(x) = sin(x^3) find f^(15)(0) by which I mean find the 15th derivative of f. Do I have to write out all the derivatives and look for a pattern somewhere or is there an easier way?
 
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  • #2
Do you know the power series expansion for sin? If so, you can read off the derivatives from the Taylor series expansion
[tex]
f(x) = \sum_{n=0}^\infty\frac{x^n}{n!}f^{(n)}(0).
[/tex]
 
  • #3
Ok, so from the maclaurin series with x^3 substituted I get f(x) = x^3 - (x^9/ 3!) + (x^15/ 5!) and just from this I can see the 15th derivative of the function is going to be 15!/ 5!. Is that all correctÉ
 
  • #4
yes!
 

1. What is the meaning of f(x) in the equation?

F(x) represents the function of x, which is sin(x^3) in this case. It is a mathematical representation of the relationship between the input (x) and output (sin(x^3)) values.

2. How do you calculate f^(15)(0)?

To calculate f^(15)(0), we first need to find the derivative of the function f(x) = sin(x^3). We can use the chain rule to do this, where we multiply the derivative of the outer function (sin) by the derivative of the inner function (x^3). We then take the 15th derivative of this result and substitute x = 0 to find the value of f^(15)(0).

3. What is the significance of f^(15)(0)?

F^(15)(0) represents the 15th derivative of the function f(x) at x = 0. In other words, it is the rate of change of the 14th derivative of sin(x^3) at x = 0. This value can be used to determine the behavior of the function at that point, such as whether it is increasing or decreasing, and how rapidly it is changing.

4. How does the value of f^(15)(0) relate to the graph of f(x)?

The value of f^(15)(0) can give us information about the shape of the graph of f(x) at x = 0. For example, if f^(15)(0) is positive, it means that the graph of f(x) is concave up at x = 0. If f^(15)(0) is negative, it means that the graph of f(x) is concave down at x = 0. This can help us visualize the behavior of the function at that point.

5. What is the practical application of finding f^(15)(0)?

F^(15)(0) can be useful in many applications, such as physics, engineering, and economics. It can help us understand the behavior of complex systems and make predictions about their future behavior. For example, in physics, f^(15)(0) can help us determine the acceleration of a moving object at a specific point in time. In economics, it can help us analyze the rate of change of a market trend at a particular point.

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