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Differentiation of Hyperbolic Functions

Formulas and examples, with detailed solutions, on the derivatives of hyperbolic functions are presented. For definitions and graphs of hyperbolic functions go to Graphs of Hyperbolic Functions



function

derivative

f(x) = sinh x

f '(x) = cosh x

f(x) = cosh x

f '(x) = sinh x

f(x) = tanh x

= sinh x / cosh x
f '(x) = sech 2 x

f(x) = coth x = 1 / tanh x

= cosh x / sinh x
f '(x) = - csch 2x

f(x) = csch x

= 1 / sinh x

f '(x) = - csch x coth x

f(x) = sech x

= 1 / cosh x

f '(x) = - sech x tanh x

Example 1: Find the derivative of f(x) = sinh (x 2)

Solution to Example 1:

  • Let u = x 2 and y = sinh u and use the chain rule to find the derivative of the given function f as follows.

    f '(x) = (dy / du) (du / dx)

  • dy / du = cosh u, see formula above, and du / dx = 2 x

    f '(x) = 2 x cosh u = 2 x cosh (x 2)

  • Substitute u = x 2 in f '(x) to obtain

    f '(x) = 2 x cosh (x 2)

Example 2: Find the derivative of f(x) = 2 sinh x + 4 cosh x

Solution to Example 2:

  • Let g(x) = 2 sinh x and h(x) = 4 cosh x, function f is the sum of functions g and h: f(x) = g(x) + h(x). Use the sum rule, f '(x) = g '(x) + h '(x), to find the derivative of function f

    f '(x) = 2 cosh x + 4 sinh x


Example 3: Find the derivative of f(x) = cosh x / sinh (x 2)

Solution to Example 3:

  • Let g(x) = cosh x and h(x) = sinh x 2, function f is the quotient of functions g and h: f(x) = g(x) / h(x). Hence we use the quotient rule, f '(x) = [ h(x) g '(x) - g(x) h '(x) ] / h(x) 2, to find the derivative of function f.

    g '(x) = sinh x

    h '(x) = 2 x cosh x 2 (see example 2 above)

    f '(x) = [ h(x) g '(x) - g(x) h '(x) ] / h(x) 2

    = [ (sinh x 2) (sinh x) - (cosh x)(2 x cosh x 2) ] / (sinh x 2) 2


Example 4: Find the derivative of f(x) = (sinh x) 2

Solution to Example 4:

  • Let u = sinh x and y = u 2, Use the chain rule to find the derivative of function f as follows.

    f '(x) = (dy / du) (du / dx)

  • dy / du = 2 u and du / dx = cosh x

    f '(x) = 2 u cosh x

  • Put u = sinh x in f '(x) obtained above

    f '(x) = 2 sinh x cosh x


Exercises Find the derivative of each function.

1 - f(x) = sinh (x
3)

2 - g(x) = - sinh x + 4 cosh (x + 2)

3 - h(x) = cosh x
2/ sinh x

4 - j(x) = - (cosh x)
2

solutions to the above exercises

1 - f '(x) = (3x
2) cosh (x 3)

2 - g '(x) = - cosh x + 4 sinh (x + 2)

3 - h '(x) = [ (2 x sinh x
2)(sinh x) - (cosh x 2)(cosh x) ] / [sinh x] 2

4 - j '(x) = - 2 (cosh x)(sinh x)

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Updated: 2 April 2013

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