# Find the Function Given f''(x) = 2 + cos(x), f(0) = -1, f(pi/2) = 0 | Summary and Q&A

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July 20, 2022
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The Math Sorcerer
Find the Function Given f''(x) = 2 + cos(x), f(0) = -1, f(pi/2) = 0

## TL;DR

Integrate the second derivative with given conditions to find the function f.

## Key Insights

• ❓ The problem involves determining the function given its second derivative and specific conditions.
• ❓ Integrating the second derivative twice is required to find the original function.
• 🆘 The given conditions help determine the constants in the function.
• ✊ The power rule and trigonometric identities are essential tools in solving this problem.
• 🈸 The solution showcases the application of calculus concepts in finding functions from given derivatives.
• ❓ The existence of conditions for the function enables a unique solution.
• ❓ The problem highlights the importance of understanding integration and differentiation principles.

## Transcript

hi in this problem we have that the second derivative of a function is equal to two plus cosine x we also have these two conditions we're told that f of zero is negative one and f of pi over two is zero and the question is to find f let's go ahead and try to do this so i'm thinking we're going to have to integrate both sides of this equation to sta... Read More

### Q: How do we find the first derivative of the function f?

To find the first derivative of f, we integrate the second derivative, following the principle that integrating a derivative results in the original function. Then, we apply the power rule and trigonometric identity to find the derivative.

### Q: What are the steps to find the constant of integration?

Initially, we have two conditions, f(0) = -1 and f(pi/2) = 0, which allow us to determine the constants in the function. Plugging in the given values and solving the resulting equations, we can find the constant of integration, typically denoted by "c" or "k".

### Q: How do we solve the equation to find the constant "c"?

By substituting the given value f(pi/2) = 0 into the function and solving the equation, we can determine the value of c. By simplifying the equation and applying basic algebraic steps, we find that c = -pi/2.

### Q: What is the final form of the function f?

The final form of the function f is f(x) = x^2 - cos(x) - (pi/2) * x. This function satisfies the given conditions of f(0) = -1 and f(pi/2) = 0.

## Summary & Key Takeaways

• The problem requires finding the function f given its second derivative and two conditions.

• Integrating the second derivative twice, applying the power rule and trigonometric identity, results in the function f.

• Using the given conditions, the constants in the function can be determined, resulting in the final answer.