.expand() like in Maxima

[nickkolok]

Is there a native, built-in way to turn (a+b)(c+d) into ac+bc+ad+bd? Or do we have to manually define:

math.expandProdSums = function(expr){
	return math.simplify(expr, [
		{ r: 'n1*n3 + n2*n3', l: '(n1+n2)*n3' },
		{ r: 'n1*n3 - n2*n3', l: '(n1-n2)*n3' },
	]);
}

[josdejong]

The function rationalize will do that for you, though your solution of passing the rules to simplify works too :)

math.rationalize('(a+b)*(c+d)').toString() // "a * c + a * d + b * c + b * d"