# Function simplifyConstant simplifyConstant() takes a mathjs expression (either a Node representing a parse tree or a string which it parses to produce a node), and replaces any subexpression of it consisting entirely of constants with the computed value of that subexpression. ## Syntax ```js simplifyConstant(expr) simplifyConstant(expr, options) ``` ### Parameters Parameter | Type | Description --------- | ---- | ----------- `node` | Node | string | The expression to be simplified `options` | Object | Simplification options, as per simplify() ### Returns Type | Description ---- | ----------- Node | Returns expression with constant subexpressions evaluated ### Throws Type | Description ---- | ----------- ## Examples ```js math.simplifyConstant('x + 4*3/6') // Node "x + 2" math.simplifyConstant('z cos(0)') // Node "z 1" math.simplifyConstant('(5.2 + 1.08)t', {exactFractions: false}) // Node "6.28 t" ``` ## See also [simplify](simplify.md), [simplifyCore](simplifyCore.md), [resolve](resolve.md), [derivative](derivative.md)