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dfactorial

double factorial

Calculates the double factorial of a number.

Usage: nerdamer("dfactorial(x)")

Parameters

expression x

Returns the appropriate value if possible otherwise it returns the function with the simplified expression

Returns

Expression

EXAMPLES:

var x = nerdamer('dfactorial(5)').evaluate();
console.log(x.text());
x = nerdamer('dfactorial(9)').evaluate();
console.log(x.text());
x = nerdamer('dfactorial(x+1)').evaluate();
console.log(x.text());

OUTPUT:

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