Tangent Slope at Point y=\cosh x = 1

[bard]

at what point on the curve $$y=\cosh x$$ does the tangent have slope 1


I have no idea how to approach this problem

my work

$$1=\sinh x\frac{dy}{dx}$$

$$\frac{1}{sinh x}=\frac{dy}{dx}$$

 

[NateTG]

It would probably help to you use the definitions.

For example:
$$\sinh{x}= \frac{e^{x}-e^{-x}}{2}$$

 

[bard]

yah I found the answer as x=ln[1+sqt2]----thanks for your help