Simple partial differentiation

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SUMMARY

The discussion focuses on differentiating the function f = arctan(u/v) with respect to u using the chain rule. The initial attempt yields the derivative fu = 1/(v + u²/v), which differs from the solutions manual's answer of v/(u² + v²). The key mistake identified is the need to multiply both the numerator and denominator by "v" to achieve the correct form of the derivative.

PREREQUISITES
  • Understanding of basic calculus concepts, specifically differentiation
  • Familiarity with the chain rule in calculus
  • Knowledge of trigonometric functions, particularly arctangent
  • Ability to manipulate algebraic expressions
NEXT STEPS
  • Review the chain rule in calculus for differentiating composite functions
  • Practice differentiating trigonometric functions, focusing on arctan
  • Explore algebraic manipulation techniques to simplify derivatives
  • Study examples of partial differentiation for functions of multiple variables
USEFUL FOR

Students studying calculus, particularly those focusing on differentiation techniques, as well as educators looking for examples of common mistakes in partial differentiation.

kasse
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Homework Statement



Differentiate f = arctan(u/v) with respect to u


The Attempt at a Solution



Using the chain rule

fu = (1/(1 + (u/v)2)) * 1/v = 1/(v + u2/v)

The solutions manual says v/(u2 + v2)

What is my mistake?
 
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Multiply the top and bottom of your answer by "v" and see what you get :wink:
 

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