Solving equation with natural log with inverse hyperbolic

  • Thread starter yojo95
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Homework Statement



Solve ln(sinh-1(x)) = 1
(Just give the formula for x, no calculator is necessary)
sinh-1(x) = asinh


Homework Equations





The Attempt at a Solution



When I did this, I knew sinh-1(x) = ln(x + sqrt.(x^2 +1), but the equation would look like
ln(ln(x + sqrt.(x^2 + 1 )) = 1, which looks weird because I don't what to do afterwards
So then I tried exponentiate both sides and it will be asinh(x) = e then multiplying both sides by sinh, so my answer is x = sinhe, is this right?
 

Answers and Replies

  • #2
HallsofIvy
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You do NOT 'multiply both sides by sinh'- there is no multiplication involved here! After you take the exponential of both sides you have sinh-1(x)= e. Now take sinh of both sides of that: sinh(sinh-1(x))= sinh(e).

What is sinh(sinh-1(x))?
 
  • #3
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oh sorry, What i meant was "take" not "multiply" even though i typed multiply -_-

ok so then, sinh(sinh-1(x)) = sinh-1(sinh(x)) = x ?
 

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