is a variable defined in `
Its value is
Type of simplification applied to results.
If `none', results are not simplified when pushed on the stack.
If `num', functions are simplified only when args are constant.
If nil, only limited simplifications are applied.
If `binary', `math-clip' is applied if appropriate.
If `alg', `math-simplify' is applied.
If `ext', `math-simplify-extended' is applied.
If `units', `math-simplify-units' is applied.