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Notes by Category University Engineering

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Hyperbolic Functions

Hyperbolic functions are similar to trigonometric functions, but are defined in terms of exponentials. There are three fundamental hyperbolic functions: sinh, cosh and tanh:

Similarly, the reciprocal of each function exists:

Hyperbolic Graphs

For any value of x, sinh(-x) = -sinh(x)
• y = sinh(x) has no asymptotes

For any value of x, cosh(-x) = -cosh(x)
• y = cosh(x) never goes below y=1

• y = tanh(x) has asymptotes at y = Â±1, and always stays between these

Inverse Hyperbolic Functions

Just like sin, cos and tan, the hyperbolic functions have inverses, arcsinh, arcosh and artanh:

The graphs of these are their respective reflections in the line y=x:

Hyperbolic Identities & Equations

The same identities exist for hyperbolic functions as they do for trigonometric functions:

sinh(A Â± B) â‰¡ sinh(A) cosh(B) Â± cosh(A) sinh(B)
cosh(A Â± B) â‰¡ cosh(A) cosh(B) âˆ“ sinh(A) sinh(B)

Equations with a sinhÂ² in them, however, are different:

coshÂ²(x) - sinhÂ²(x) â‰¡ 1

Note that here, the sinhÂ² is negative (the trigonometric identity is sinÂ² + cosÂ² â‰¡ 1). This is known as Osborn's rule:

According to Osborn's rule, when using trigonometric identities as hyperbolic identities, any sinhÂ² must be multiplied by -1.

Differentiating Hyperbolic Functions

This is very similar to trigonometric functions:

Note that the derivative of cosh(x) is positive sinh(x), not negative.

The inverse functions differentiate as such:

Integrating Hyperbolic Functions

Simply the reverse of differentiation, but remember the " +c " and that the signs are different:

The inverse functions can also be integrated:

These standard results for when the equation you need to integrate does not have either (xÂ²+1) or (xÂ²-1) in the root in the denominator: