Math Problem Statement

Find the particular solution for the anti-derivative of f(x)=2x^3 +1-sin(x), if f(0)=1.

Solution

To find the particular solution for the anti-derivative of the function f(x)=2x3+1sin(x)f(x) = 2x^3 + 1 - \sin(x), given that F(0)=1F(0) = 1, we'll follow these steps:

Step 1: Find the General Antiderivative

To obtain the antiderivative F(x)F(x), we integrate f(x)f(x) with respect to xx:

F(x)=(2x3+1sin(x))dxF(x) = \int \left(2x^3 + 1 - \sin(x)\right) \, dx

We can break this down into the sum of three separate integrals:

F(x)=2x3dx+1dxsin(x)dxF(x) = \int 2x^3 \, dx + \int 1 \, dx - \int \sin(x) \, dx

Step 2: Integrate Each Term

Now, let's integrate each term individually:

  1. Integrating 2x32x^3: 2x3dx=2x44=x42\int 2x^3 \, dx = \frac{2x^4}{4} = \frac{x^4}{2}

  2. Integrating 11: 1dx=x\int 1 \, dx = x

  3. Integrating sin(x)-\sin(x): sin(x)dx=cos(x)\int -\sin(x) \, dx = \cos(x)

So, combining these results, the general form of the antiderivative is:

F(x)=x42+x+cos(x)+CF(x) = \frac{x^4}{2} + x + \cos(x) + C

where CC is the constant of integration.

Step 3: Determine the Constant CC

To find the particular solution, we use the condition F(0)=1F(0) = 1. Substituting x=0x = 0 into the general form:

F(0)=(0)42+(0)+cos(0)+C=1F(0) = \frac{(0)^4}{2} + (0) + \cos(0) + C = 1

Since cos(0)=1\cos(0) = 1, this simplifies to:

1+C=11 + C = 1

So, C=0C = 0.

Final Answer

The particular solution for the antiderivative is:

F(x)=x42+x+cos(x)\boxed{F(x) = \frac{x^4}{2} + x + \cos(x)}

This function satisfies the initial condition F(0)=1F(0) = 1.


Would you like any further details or have any questions? Here are some related questions you might find helpful:

  1. How would the antiderivative change if f(0)f(0) were a different value?
  2. What is the derivative of F(x)F(x) to verify it's indeed the antiderivative of f(x)f(x)?
  3. Can you find F(1)F(1) given the function F(x)F(x)?
  4. How would you handle an initial condition where f(x)f(x) has a trigonometric function like cos(x)\cos(x) instead of sin(x)\sin(x)?
  5. What does the constant CC represent in the context of indefinite integrals?

Tip: Always double-check the boundary or initial conditions when solving for the constant in an indefinite integral to ensure the particular solution satisfies the given condition.

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Math Problem Analysis

Mathematical Concepts

Integration
Antiderivative
Constant of Integration

Formulas

Integral of polynomials
Integral of constant
Integral of trigonometric functions

Theorems

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Suitable Grade Level

Advanced High School / College