Math Problem Statement

Maclaurin series for the antiderivative of sin(x^3)

Solution

The Maclaurin series for the antiderivative of sin(x3)\sin(x^3) can be derived by expanding sin(x3)\sin(x^3) into its Maclaurin series and then integrating term by term.

Step-by-step solution:

  1. Recall the Maclaurin series for sin(x)\sin(x): sin(x)=n=0(1)n(2n+1)!x2n+1.\sin(x) = \sum_{n=0}^\infty \frac{(-1)^n}{(2n+1)!} x^{2n+1}.

  2. Substitute x3x^3 into the series for sin(x)\sin(x): sin(x3)=n=0(1)n(2n+1)!(x3)2n+1.\sin(x^3) = \sum_{n=0}^\infty \frac{(-1)^n}{(2n+1)!} (x^3)^{2n+1}.

    Simplify the exponents: sin(x3)=n=0(1)n(2n+1)!x3(2n+1)=n=0(1)n(2n+1)!x6n+3.\sin(x^3) = \sum_{n=0}^\infty \frac{(-1)^n}{(2n+1)!} x^{3(2n+1)} = \sum_{n=0}^\infty \frac{(-1)^n}{(2n+1)!} x^{6n+3}.

  3. Antidifferentiate term by term: To find the antiderivative, integrate each term: sin(x3)dx=n=0(1)n(2n+1)!x6n+3dx.\int \sin(x^3) \, dx = \int \sum_{n=0}^\infty \frac{(-1)^n}{(2n+1)!} x^{6n+3} \, dx.

    Integrating term by term: x6n+3dx=x6n+46n+4.\int x^{6n+3} \, dx = \frac{x^{6n+4}}{6n+4}.

    Thus, the series for the antiderivative becomes: sin(x3)dx=n=0(1)n(2n+1)!(6n+4)x6n+4+C,\int \sin(x^3) \, dx = \sum_{n=0}^\infty \frac{(-1)^n}{(2n+1)!(6n+4)} x^{6n+4} + C, where CC is the constant of integration.

Final Answer:

The Maclaurin series for the antiderivative of sin(x3)\sin(x^3) is: sin(x3)dx=n=0(1)n(2n+1)!(6n+4)x6n+4+C.\int \sin(x^3) \, dx = \sum_{n=0}^\infty \frac{(-1)^n}{(2n+1)!(6n+4)} x^{6n+4} + C.

Would you like further clarifications or a specific numerical example?


Here are 5 related questions you might find interesting:

  1. How would the Maclaurin series change if it were for cos(x3)\cos(x^3) instead?
  2. Can this series be approximated numerically for a specific value of xx?
  3. What is the radius of convergence of this series?
  4. How does the term-by-term integration work for other functions, like ex3e^{x^3}?
  5. Could this series be truncated for a simpler approximation?

Tip: When dealing with integrals of non-elementary functions, series expansions are often the best tool for approximations and further analysis!

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Math Problem Analysis

Mathematical Concepts

Series Expansion
Maclaurin Series
Term-by-Term Integration

Formulas

Maclaurin series for sin(x): sin(x) = sum_{n=0}^∞ ((-1)^n / (2n+1)!) x^(2n+1)
Integration formula for x^n: ∫x^n dx = x^(n+1) / (n+1) (for n ≠ -1)

Theorems

Term-by-term integration theorem for series

Suitable Grade Level

Undergraduate (Calculus II or Series and Sequences Topics)