Find derivative using fundamental theorem of calculus part 1

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SUMMARY

The discussion centers on the application of the Fundamental Theorem of Calculus to find the derivative of a function involving cos(x^2). The user attempted to solve the problem by flipping the function due to the cosine term in the denominator, resulting in an expression of -[(1+cos(x^2))(-sin(x^2))(2x)]. After substituting sqrt(pi/2), the user consistently arrived at sqrt(2pi), while the expected answer was -sqrt(2pi). The consensus among participants is that the user's calculations are correct, suggesting a potential error in the provided answer.

PREREQUISITES
  • Understanding of the Fundamental Theorem of Calculus
  • Knowledge of trigonometric functions and their derivatives
  • Familiarity with substitution methods in calculus
  • Ability to manipulate algebraic expressions involving trigonometric identities
NEXT STEPS
  • Review the Fundamental Theorem of Calculus and its applications
  • Practice derivatives involving trigonometric functions
  • Explore common pitfalls in calculus problems involving substitutions
  • Investigate the properties of cosine and sine functions in calculus
USEFUL FOR

Students studying calculus, particularly those focusing on derivatives and the Fundamental Theorem of Calculus, as well as educators looking for common student misconceptions in these topics.

kraphysics
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Homework Statement



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The Attempt at a Solution



since cos(x^2) is on bottom i flipped it and so it becomes negative. then I got

-[(1+cos(x^2))(-sin (x^2))(2x)]

substituting with sqrt(pi/2) I keep getting the answer as sqrt(2pi) since the negatives cancel however it says the answer is supposed to be -sqrt(2pi). What am I doing wrong?
 
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I don't think you are doing anything wrong. I think the given answer is wrong.
 
Dick said:
I don't think you are doing anything wrong. I think the given answer is wrong.

Really?!
thank you. I've been going crazy over this question for a long time
 

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