/// <summary>
/// Calculate partial differentiation of function, represented as expression
/// </summary>
/// <seealso cref="Differentiate(INode,int,string)"/>
/// <param name="e"></param>
/// <param name="index"></param>
/// <param name="variable"></param>
/// <returns></returns>
public static Expression Differentiate(Expression e, int index = 0, String variable = "")
{
var node = Expressions2Tree.Parse(e);
return(Tree2Expression.Parse(Differentiate(node, index, variable)));
}
/// <summary>
/// Simplify expression, using simplification rules from <see cref="RulesLibrary"/>
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
public static Expression Simplify(Expression e)
{
return(Tree2Expression.Parse(Simplify(Expressions2Tree.Parse(e))));
}