17Calculus Precalculus - Inverse Hyperbolic Functions
17Calculus
Inverse Hyperbolic Functions
Before you study this page, make sure you have gone through Hyperbolic Functions and understand those first.
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As you probably expect, we can define inverses of hyperbolic functions. Some of the hyperbolic functions require a restricted domain since only one-to-one functions can have inverses. (For more detail, see the inverse functions page.)
Let's think about what the equations might look like. Since the hyperbolic functions are defined in terms of \(e^x\), we would except the inverse hyperbolic functions to be some form involving \(\ln(x)\). This is indeed the case. Here is a table listing the inverse hyperbolic functions.
\(\arcsinh(x) = \ln\left[ x + \sqrt{x^2+1} \right]\) |
Domain: all real numbers | |
\(\arccosh(x) = \ln\left[ x + \sqrt{x^2-1} \right]\) |
Domain: \( [1, +\infty) \) | |
\(\displaystyle{ \arctanh(x) = \frac{1}{2} \ln\left[ \frac{1+x}{1-x} \right] }\) |
Domain: \( (-1,1) \) | |
\(\displaystyle{ \arccoth(x) = \frac{1}{2}\ln\left[ \frac{x+1}{x-1} \right] }\) |
Domain: \( (-\infty, -1) \cup ( 1, \infty ) \) | |
\(\displaystyle{ \arcsech(x) = \ln \left[ \frac{1}{x} + \sqrt{\frac{1}{x^2}-1} \right] }\) |
Domain: \((0,1]\) | |
\(\displaystyle{ \arccsch(x) = \ln \left[ \frac{1}{x} + \sqrt{\frac{1}{x^2}+1} \right] }\) |
Domain: all real numbers except for zero | |
This GeoGebra page shows the graphs of the inverse hyperbolic functions. |
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This Wikipedia page contains more information about inverse hyperbolic functions. | ||
Okay, time for the practice problems.
Practice
Unless otherwise instructed, use the definitions of the related hyperbolic functions in terms of \(e^x\) to get the equations for the given functions involving the natural logarithm.
\(\text{arcsinh}(x)\)
Problem Statement |
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Use the definition of the hyperbolic function \(\sinh(x)\) in terms of \(e^x\) to get the equation for \(\text{arcsinh}(x)\) involving the natural logarithm.
Hint |
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\(\sinh(x) = \) \(\displaystyle{ \frac{e^x - e^{-x}}{2} }\)
Problem Statement
Use the definition of the hyperbolic function \(\sinh(x)\) in terms of \(e^x\) to get the equation for \(\text{arcsinh}(x)\) involving the natural logarithm.
Hint
\(\sinh(x) = \) \(\displaystyle{ \frac{e^x - e^{-x}}{2} }\)
Solution
2852 video solution
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\(\text{arccosh}(x)\)
Problem Statement |
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Use the definition of the hyperbolic function \(\cosh(x)\) in terms of \(e^x\) to get the equation for \(\text{arccosh}(x)\) involving the natural logarithm.
Hint |
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\(\cosh(x) = \) \(\displaystyle{ \frac{e^x + e^{-x}}{2} }\)
Problem Statement
Use the definition of the hyperbolic function \(\cosh(x)\) in terms of \(e^x\) to get the equation for \(\text{arccosh}(x)\) involving the natural logarithm.
Hint
\(\cosh(x) = \) \(\displaystyle{ \frac{e^x + e^{-x}}{2} }\)
Solution
2853 video solution
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\(\text{arctanh}(x)\)
Problem Statement |
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Use the definition of the hyperbolic function \(\tanh(x)\) in terms of \(e^x\) to get the equation for \(\text{arctanh}(x)\) involving the natural logarithm.
Hint |
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\(\tanh(x) = \) \(\displaystyle{ \frac{\sinh(x)}{\cosh(x)} = }\) \(\displaystyle{ \frac{e^x - e^{-x}}{e^x + e^{-x}} = }\) \(\displaystyle{ \frac{e^{2x} - 1}{e^{2x} + 1} }\)
Problem Statement
Use the definition of the hyperbolic function \(\tanh(x)\) in terms of \(e^x\) to get the equation for \(\text{arctanh}(x)\) involving the natural logarithm.
Hint
\(\tanh(x) = \) \(\displaystyle{ \frac{\sinh(x)}{\cosh(x)} = }\) \(\displaystyle{ \frac{e^x - e^{-x}}{e^x + e^{-x}} = }\) \(\displaystyle{ \frac{e^{2x} - 1}{e^{2x} + 1} }\)
Solution
2854 video solution
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