Understanding Hyperbolic Functions: Problem & Answer Explained

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SUMMARY

The discussion centers on the understanding of hyperbolic functions, specifically the transition from one function to another in a problem involving the hyperbolic tangent (tanh). The original poster questions the validity of a solution that assumes the conclusion without sufficient justification. A consensus emerges that while the substitution method used in the solution is acceptable, it requires a clear statement regarding the uniqueness of the solution to avoid ambiguity.

PREREQUISITES
  • Understanding of hyperbolic functions, particularly hyperbolic tangent (tanh).
  • Familiarity with mathematical problem-solving techniques involving substitutions.
  • Knowledge of mathematical proof techniques, especially concerning uniqueness.
  • Basic proficiency in interpreting mathematical diagrams and images.
NEXT STEPS
  • Study the properties and applications of hyperbolic functions in calculus.
  • Learn about mathematical proof techniques, focusing on uniqueness and existence theorems.
  • Explore substitution methods in solving differential equations involving hyperbolic functions.
  • Review examples of common pitfalls in mathematical problem-solving to enhance critical thinking.
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Students and educators in mathematics, particularly those studying calculus and hyperbolic functions, as well as anyone involved in mathematical problem-solving and proof techniques.

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I have a picture of a problem and the answer. But a place in the answer I can't understand how they get from one function to the next, could you guys please explain it? I have marked it in red?

http://img381.imageshack.us/img381/1839/hyperik2.png
 
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Well the way they did it was they substituted in for the tanh, using what v is supposed to be. However, I don't necessarily agree with this solution because it starts by assuming the conclusion.

Edit: Actually, I suppose that would be okay, as long as you add a sentence, saying that the solution must be unique.
 
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thanks!
 

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