diff --git a/docs/src/functions/images/hyperboliccosine-curve.png b/docs/src/functions/images/hyperboliccosine-curve.png
new file mode 100644
index 0000000..587b11d
Binary files /dev/null and b/docs/src/functions/images/hyperboliccosine-curve.png differ
diff --git a/docs/src/functions/images/hyperbolicsine-curve.png b/docs/src/functions/images/hyperbolicsine-curve.png
new file mode 100644
index 0000000..564c338
Binary files /dev/null and b/docs/src/functions/images/hyperbolicsine-curve.png differ
diff --git a/docs/src/functions/images/hyperbolictangent-curve.png b/docs/src/functions/images/hyperbolictangent-curve.png
new file mode 100644
index 0000000..0b9d1de
Binary files /dev/null and b/docs/src/functions/images/hyperbolictangent-curve.png differ
diff --git a/docs/src/functions/math-and-trigonometry.md b/docs/src/functions/math-and-trigonometry.md
index 936dbee..51d212f 100644
--- a/docs/src/functions/math-and-trigonometry.md
+++ b/docs/src/functions/math-and-trigonometry.md
@@ -30,7 +30,7 @@ You can track the progress in this [GitHub issue](https://github.com/ironcalc/Ir
| COMBIN | | – |
| COMBINA | | – |
| COS | | [COS](math_and_trigonometry/cos) |
-| COSH | | – |
+| COSH | | [COSH](math_and_trigonometry/cosh) |
| COT | | – |
| COTH | | – |
| CSC | | – |
@@ -78,7 +78,7 @@ You can track the progress in this [GitHub issue](https://github.com/ironcalc/Ir
| SEQUENCE | | – |
| SIGN | | – |
| SIN | | [SIN](math_and_trigonometry/sin) |
-| SINH | | – |
+| SINH | | [SINH](math_and_trigonometry/sinh) |
| SQRT | | – |
| SQRTPI | | – |
| SUBTOTAL | | – |
@@ -91,5 +91,5 @@ You can track the progress in this [GitHub issue](https://github.com/ironcalc/Ir
| SUMX2PY2 | | – |
| SUMXMY2 | | – |
| TAN | | [TAN](math_and_trigonometry/tan) |
-| TANH | | – |
+| TANH | | [TANH](math_and_trigonometry/tanh) |
| TRUNC | | – |
diff --git a/docs/src/functions/math_and_trigonometry/cosh.md b/docs/src/functions/math_and_trigonometry/cosh.md
index 121f79a..577b876 100644
--- a/docs/src/functions/math_and_trigonometry/cosh.md
+++ b/docs/src/functions/math_and_trigonometry/cosh.md
@@ -3,9 +3,37 @@ layout: doc
outline: deep
lang: en-US
---
+# COSH function
+## Overview
+COSH is a function of the Math and Trigonometry category that calculates the hyperbolic cosine of a number.
+## Usage
+### Syntax
+**COSH(number) => cosh**
+### Argument descriptions
+* *number* ([number](/features/value-types#numbers), required). The hyperbolic angle whose hyperbolic cosine is to be calculated, expressed in radians.
+### Additional guidance
+The formula for the hyperbolic cosine is:
+$$
+\text{cosh(x)} = \dfrac{e^x+e^{-x}}{2}
+$$
+### Returned value
+COSH returns a real [number](/features/value-types#numbers) that is the hyperbolic cosine of the specified hyperbolic angle.
+### Error conditions
+* In common with many other IronCalc functions, COSH propagates errors that are found in its argument.
+* If no argument, or more than one argument, is supplied, then COSH returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of the *number* argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then COSH returns the [`#VALUE!`](/features/error-types.md#value) error.
+* For some argument values, COSH may return a [`#DIV/0!`](/features/error-types.md#div-0) error.
+
+## Details
+* The COSH function utilizes the *cosh()* method provided by the [Rust Standard Library](https://doc.rust-lang.org/std/).
+* The figure below illustrates the COSH function.
+
-# COSH
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=cosh).
-::: warning
-🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-:::
\ No newline at end of file
+## Links
+* For more information about hyperbolic functions, visit Wikipedia's [Hyperbolic functions](https://en.wikipedia.org/wiki/Hyperbolic_functions) page.
+* See also IronCalc's [SINH](/functions/math_and_trigonometry/sinh), [COS](/functions/math_and_trigonometry/cos) and [TAN](/functions/math_and_trigonometry/tan) functions.
+* Visit Microsoft Excel's [COSH function](https://support.microsoft.com/en-us/office/cosh-function-e460d426-c471-43e8-9540-a57ff3b70555) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093477) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/COSH) provide versions of the COSH function.
\ No newline at end of file
diff --git a/docs/src/functions/math_and_trigonometry/sinh.md b/docs/src/functions/math_and_trigonometry/sinh.md
index 29a6a2d..7d0a686 100644
--- a/docs/src/functions/math_and_trigonometry/sinh.md
+++ b/docs/src/functions/math_and_trigonometry/sinh.md
@@ -3,9 +3,37 @@ layout: doc
outline: deep
lang: en-US
---
+# SINH function
+## Overview
+SINH is a function of the Math and Trigonometry category that calculates the hyperbolic sine of a number.
+## Usage
+### Syntax
+**SINH(number) => sinh**
+### Argument descriptions
+* *number* ([number](/features/value-types#numbers), required). The hyperbolic angle whose hyperbolic sine is to be calculated, expressed in radians.
+### Additional guidance
+The formula for the hyperbolic sine is:
+$$
+\text{sinh(x)} = \dfrac{e^x-e^{-x}}{2}
+$$
+### Returned value
+SINH returns a real [number](/features/value-types#numbers) that is the hyperbolic sine of the specified hyperbolic angle.
+### Error conditions
+* In common with many other IronCalc functions, SINH propagates errors that are found in its argument.
+* If no argument, or more than one argument, is supplied, then SINH returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of the *number* argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then SINH returns the [`#VALUE!`](/features/error-types.md#value) error.
+* For some argument values, SINH may return a [`#DIV/0!`](/features/error-types.md#div-0) error.
+
+## Details
+* The SINH function utilizes the *sinh()* method provided by the [Rust Standard Library](https://doc.rust-lang.org/std/).
+* The figure below illustrates the SINH function.
+
-# SINH
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=sinh).
-::: warning
-🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-:::
\ No newline at end of file
+## Links
+* For more information about hyperbolic functions, visit Wikipedia's [Hyperbolic functions](https://en.wikipedia.org/wiki/Hyperbolic_functions) page.
+* See also IronCalc's [SIN](/functions/math_and_trigonometry/sin), [COS](/functions/math_and_trigonometry/cos) and [TAN](/functions/math_and_trigonometry/tan) functions.
+* Visit Microsoft Excel's [SINH function](https://support.microsoft.com/en-us/office/sinh-function-4958f7e2-0d2b-4846-8ef5-8475f3aea5fb) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093517) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/SINH) provide versions of the SINH function.
\ No newline at end of file
diff --git a/docs/src/functions/math_and_trigonometry/tanh.md b/docs/src/functions/math_and_trigonometry/tanh.md
index 561856b..189a378 100644
--- a/docs/src/functions/math_and_trigonometry/tanh.md
+++ b/docs/src/functions/math_and_trigonometry/tanh.md
@@ -3,9 +3,37 @@ layout: doc
outline: deep
lang: en-US
---
+# TANH function
+## Overview
+TANH is a function of the Math and Trigonometry category that calculates the hyperbolic tangent of a number.
+## Usage
+### Syntax
+**TANH(number) => tanh**
+### Argument descriptions
+* *number* ([number](/features/value-types#numbers), required). The hyperbolic angle whose hyperbolic tangent is to be calculated, expressed in radians.
+### Additional guidance
+The formula for the hyperbolic tangent is:
+$$
+\text{tanh(x)} = \dfrac{sinh(x)}{cosh(x)} = \dfrac{e^x-e^{-x}}{e^x+e^{-x}}
+$$
+### Returned value
+TANH returns a real [number](/features/value-types#numbers) in the range (-1,+1) that is the hyperbolic tangent of the specified hyperbolic angle.
+### Error conditions
+* In common with many other IronCalc functions, TANH propagates errors that are found in its argument.
+* If no argument, or more than one argument, is supplied, then TANH returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of the *number* argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then TANH returns the [`#VALUE!`](/features/error-types.md#value) error.
+* For some argument values, TANH may return a [`#DIV/0!`](/features/error-types.md#div-0) error.
+
+## Details
+* The TANH function utilizes the *tanh()* method provided by the [Rust Standard Library](https://doc.rust-lang.org/std/).
+* The figure below illustrates the TANH function.
+
-# TANH
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=tanh).
-::: warning
-🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-:::
\ No newline at end of file
+## Links
+* For more information about hyperbolic functions, visit Wikipedia's [Hyperbolic functions](https://en.wikipedia.org/wiki/Hyperbolic_functions) page.
+* See also IronCalc's [SINH](/functions/math_and_trigonometry/sinh), [COSH](/functions/math_and_trigonometry/cosh) and [TAN](/functions/math_and_trigonometry/tan) functions.
+* Visit Microsoft Excel's [TANH function](https://support.microsoft.com/en-us/office/tanh-function-017222f0-a0c3-4f69-9787-b3202295dc6c) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093755) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/TANH) provide versions of the TANH function.
\ No newline at end of file