The provided code is an HTML document that creates a simple calculator with a visually appealing design. The calculator allows users to perform fundamental arithmetic operations, such as addition, subtraction, multiplication, and department, as well as more superior mathematical features including rectangular root, logarithm, exponentiation, trigonometric functions, and factorial. The calculator interface is styled using CSS, with distinct button colors for operators, functions, and constants. The JavaScript code handles user input, updates the display dynamically, and evaluates mathematical expressions using the eval function. Additionally, the code defines a custom factorial function (Math.factorial) to calculate the factorial of a number. It also includes error handling to display "Error" if an invalid expression is entered.
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