The built-in calculator provides a large proportion of the capabilities of Efofex Parameters. The ability to type:

**{3 sin 20}**

and have the expression automatically calculated is crucial to most parametized questions.

Recently we improved the capabilities of the built-in calculator in two major ways.

## Improved Exact Value Calculations

The calculator can now produce exact values for expressions like **{$x^5}** if $x is already an exact value like 2/3.

## Combinations and Permutations

The calculator can now calculate expressions involving combinations and permutations like **{5C2}** and **{7P3} **