Math Problem Statement

Calculate the integrals provided in the exercises using integration by parts and related formulas.

Solution

The image contains a section on integration by parts, examples of integration formulas, and exercises with solutions. Here's a summary and analysis of the content:


Integration by Parts Formula:

If f(x)f(x) and g(x)g(x) are antiderivatives of f(x)f'(x) and g(x)g'(x), respectively, the formula is: f(x)g(x)dx=f(x)g(x)f(x)g(x)dx\int f(x) g'(x) dx = f(x) g(x) - \int f'(x) g(x) dx

Immediate Applications: The table includes simplified formulas for p(x)p(x) as a polynomial:

  1. p(x)exdx\int p(x) e^x dx
  2. p(x)lnxdx\int p(x) \ln x dx
  3. p(x)xndx\int p(x) x^n dx
  4. p(x)exdx\int p(x) e^{-x} dx

Exercises with Solutions:

1. xexdx\int x e^x dx:

Solution: F(x)=ex(x1)+c,cRF(x) = e^x (x - 1) + c, \, c \in \mathbb{R}

2. e3xdx\int e^{3x} dx:

Solution: F(x)=13e3x+c,cRF(x) = \frac{1}{3} e^{3x} + c, \, c \in \mathbb{R}

3. xlnxdx\int x \ln x dx:

Solution: F(x)=x22(lnx12)+c,cRF(x) = \frac{x^2}{2} (\ln x - \frac{1}{2}) + c, \, c \in \mathbb{R}

4. lnxdx\int \ln x dx:

Solution: F(x)=xlnxx+c,cRF(x) = x \ln x - x + c, \, c \in \mathbb{R}

5. xexdx\int x e^{-x} dx:

Solution: F(x)=ex(x+1)+c,cRF(x) = -e^{-x} (x + 1) + c, \, c \in \mathbb{R}


Would you like me to provide detailed derivations of these solutions, or do you have any specific questions about the integration techniques shown?


5 Related Questions:

  1. How is the integration by parts formula derived?
  2. Why is uu-substitution essential for some integrals in these examples?
  3. What are common scenarios where integration by parts is the best choice?
  4. Can the formula xexdx\int x e^x dx be solved in alternative ways?
  5. What is the practical significance of these integrals in physics or engineering?

Tip:

When using integration by parts, always choose uu (from udv\int u dv) to simplify the integral as much as possible, often preferring uu as a logarithmic or polynomial function.

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Math Problem Analysis

Mathematical Concepts

Integration by Parts
Antiderivatives
Logarithmic Integration
Exponential Functions

Formulas

Integration by parts formula: ∫u dv = uv - ∫v du
General formula for ∫p(x)e^x dx
General formula for ∫p(x)lnx dx

Theorems

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Suitable Grade Level

Undergraduate Calculus or Advanced High School Mathematics