pub fn diff_cas(cx: &mut Cx, expr: &CasExpr, var: &Symbol) -> Result<CasExpr>Expand description
Differentiate a CasExpr with respect to var, returning a simplified
derivative tree.
Builtin operators (+, -, *, /, ^, and the standard trig functions)
use their hard-coded rules; unrecognized operators fall through to the
extensible differentiation-rule registry.