Function D

test/compute-engine/derivatives.test.ts:11–13

(expr: string, ...vars: string[])

// Helper to create D expressions using MathJSON directly.
// (D(f, x) in LaTeX parses as the derivative function outside a quantifier
// scope, but this helper builds the D expression from an already-parsed body.)
function D(expr: string, ...vars: string[]): Expression {
  return engine.expr(['D', engine.parse(expr), ...vars]);
}

describe('D', () => {