C : Clears the entire display.DEL : Deletes the last character entered.( ) : Use for order of operations.÷ × - + : Standard arithmetic operators.^ : Power (e.g., 2^3 is 2 raised to the power of 3). Use ** internally.√ : Square root (e.g., √(9)). Remember the closing parenthesis ).sin cos tan : Trigonometric functions (input in degrees). Remember the closing parenthesis ).log : Base-10 logarithm. Remember the closing parenthesis ).ln : Natural logarithm. Remember the closing parenthesis ).π : Pi constant (approx. 3.14159).e : Euler's number constant (approx. 2.71828).! : Factorial (e.g., 5!). Calculates factorial of the number immediately preceding it. Works best at the end of a number or expression part.= : Calculates the result of the expression.