update: adds SINH documentation page

docs/src/functions/math_and_trigonometry/sinh.md

@@ -3,9 +3,36 @@ 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(<span title="Number" style="color:#1E88E5">number</span>) => <span title="Number" style="color:#1E88E5">sinh</span>**
+### 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.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+## 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.
+<center><img src="/functions/images/hyperbolicsine-curve.png" width="350" alt="Graph showing sinh(x)."></center>
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=sinh).
 
-# SINH
+## Links
-
+* For more information about hyperbolic functions, visit Wikipedia's [Hyperbolic functions](https://en.wikipedia.org/wiki/Hyperbolic_functions) page.
-::: warning
+* See also IronCalc's [SIN](/functions/math_and_trigonometry/sin), [COS](/functions/math_and_trigonometry/cos) and [TAN](/functions/math_and_trigonometry/tan) functions.
-🚧 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).
+* 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.