How to Use the Scientific Calculator

Welcome to the Scientific Calculator! This guide will help you understand and use all of its features, from basic arithmetic to complex scientific calculations.

1. The Display

The calculator has two screens to make your work easier:

• Top Screen (Expression Display): This smaller screen at the top shows the complete equation you are typing (e.g., 5 * (10 + 2)). This helps you keep track of your entire calculation.
• Main Screen (Result Display): This larger screen shows the numbers you are currently entering and the final answer after you press the equals (=) button.

2. Basic Operations

These are the buttons for everyday calculations.

• 0 - 9: The number pad for entering digits.
• . (Decimal): To enter numbers with decimal points (e.g., 3.14).
• +, -, ×, ÷: Standard buttons for addition, subtraction, multiplication, and division.
• = (Equals): Press this to see the final result of your calculation.
• AC (All Clear): Wipes the entire calculation from both screens and resets the calculator.
• DEL (Delete): Removes the last digit or operator you entered. This is useful for correcting small mistakes without starting over.
• +/-: Changes the sign of the number currently on the display from positive to negative or vice versa.

3. Scientific Functions

These buttons unlock the calculator's advanced capabilities.

• ( ) (Parentheses): Use these to group parts of your calculation. The calculator will solve the expression inside the parentheses first, which is essential for complex equations (e.g., 5 * (2 + 3) equals 25).
• sin, cos, tan: These are trigonometric functions. They calculate the sine, cosine, and tangent of a number. Make sure to select the correct angle mode (DEG or RAD) before using them.
• log: Calculates the base-10 logarithm of a number.
• ln: Calculates the natural logarithm (base e) of a number.
• x²: Squares the current number (multiplies it by itself).
• xʸ: Lets you raise a number to any power. For example, to calculate 5³, you would type 5, then xʸ, then 3, and finally =.
• √ (Square Root): Finds the square root of the current number.
• x! (Factorial): Calculates the factorial of a number (e.g., 5! = 5 × 4 × 3 × 2 × 1).
• π (Pi): Enters the mathematical constant Pi (≈ 3.14159).
• e: Enters Euler's number (≈ 2.71828).

4. Advanced Features & Memory

• DEG / RAD (Angle Mode): This is very important for trigonometry (sin, cos, tan).
  • DEG (Degrees): Use this mode when your angles are measured in degrees (e.g., 90°, 180°).
  • RAD (Radians): Use this mode when your angles are measured in radians.

  The currently active mode will be highlighted.

• 2nd (Second Function): This key acts like a "Shift" button. Pressing it gives you access to the secondary functions written above other keys. For example:
  • Pressing 2nd then sin will give you sin⁻¹ (arcsin).
  • Pressing 2nd then log will give you 10ˣ.
  • Pressing 2nd then ln will give you eˣ.
• Memory Functions: These buttons let you store and reuse a number.
  • M+ (Memory Add): Adds the number on the display to the number in memory.
  • M- (Memory Subtract): Subtracts the number on the display from the number in memory.
  • MR (Memory Recall): Shows the number currently stored in memory on the display.
  • MC (Memory Clear): Erases the number stored in memory, resetting it to zero.