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Guide to use scientific-calculator
        1. Know the Basic Layout
            Most scientific calculators have:
            - Number keys (0-9)
            - Basic operations: +, -, *, /
            - Advanced functions: sqrt (square root), x^2 (square), 1/x (reciprocal), EXP/EE (scientific notation)
            - Trigonometric functions: sin, cos, tan
        2. Performing Basic Calculations
            Example:
            To calculate 8 + 5:
            - Press: 8 + 5 =
            - Display shows: 13
        3. Using Exponents and Roots
            Square of 6:
            - Press: 6 x^2 -> Shows: 36
            Square root of 81:
            - Press: sqrt 81 or 81 sqrt -> Shows: 9
        4. Trigonometric Functions
            Make sure your calculator is in the correct mode:
           Example: sin(30 degrees):
            - Press: sin 30 = -> Answer: 0.5 )
        5. Scientific Notation
            To enter 3 * 10^5:
            - Press: 3 EXP 5 or 3 EE 5 -> Shows: 300000