> ## Documentation Index
> Fetch the complete documentation index at: https://calcs.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Equations

> Find the custom functions for the Calcs Builder equation widget, plus a worked solveSecant() example that finds where demand equals capacity.

> [card] [Equation Functions](https://calcs.com/docs/calcs-builder/equation-functions.md)
>
> Custom functions available in Calcs Builder for equation writing, widget references, iteration, and solvers

> [card] [Example: Using solveSecant()](https://calcs.com/docs/calcs-builder/solvesecant-example.md)
>
> Walkthrough of solveSecant() to find the unknown where demand equals capacity


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