// Area of a circle
var expression = new MathExpression("pi * 2^2");
var evaluation = expression.Evaluate();

// Quadratic Formula
var expression = new MathExpression("(-5 + sqrt(5^2 - 4*1*6)) / (2*1)");
var evaluation = expression.Evaluate();

// Pythagoras Theorem
var expression = new MathExpression("sqrt(3^2 + 4^2)");
var evaluation = expression.Evaluate();

// Trigonometry
var expression = new MathExpression("arccos(5/7) * 180/pi");
var evaluation = expression.Evaluate();

// Change of base
var expression = new MathExpression("log(4) / log($e)");
var evaluation = expression.Evaluate();