Inverse hyperbolic sin derivation

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SUMMARY

The derivation of the inverse hyperbolic sine function, specifically the formula for inverse sinh(x) = ln(x + sqrt(x^2 + 1)), is established through the function f(x) = (e^x - e^-x)/2. By manipulating this equation, the goal is to isolate x, leading to the application of the quadratic formula to solve for e^x. This process confirms the relationship between the hyperbolic sine function and its inverse.

PREREQUISITES
  • Understanding of hyperbolic functions, specifically sinh(x)
  • Familiarity with logarithmic functions and their properties
  • Knowledge of the quadratic formula and its application
  • Basic proficiency in algebraic manipulation of equations
NEXT STEPS
  • Study the derivation of hyperbolic functions and their inverses
  • Learn about the properties of logarithmic functions, particularly natural logarithms
  • Practice solving quadratic equations using the quadratic formula
  • Explore applications of inverse hyperbolic functions in calculus and physics
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Students studying calculus, mathematicians focusing on hyperbolic functions, and educators teaching inverse functions in mathematics.

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Homework Statement


derive the formula inverse sinhx = ln(x+sqrt(x^2+1)) for all real x


Homework Equations


sinhx=(e^x-e^-x)/2 ?



The Attempt at a Solution


i have been staring at this for awhile and i don't know how to start
what should be the first step towards deriving that formula? i just want a hint to get started
 
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Let f(x)=(ex-e-x)/2

(A function is a map from x→f(x). The inverse is therefore a map from f(x)→x. Therefore, our goal is to isolate x from the above equation.)

f(x)=(ex-e-x)/2

2f(x)=ex-e-x

2f(x)ex=(ex-e-x)ex

2f(x)ex=e2x-1

0 = e2x-2f(x)ex-1

Use the quadratic formula to find ex.
 

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