# How to input an expression

### Inputting

Expressions are very easy to input either using the buttons on the screen or the computer's keyboard.

**Example of expressions :**
sin(pi/2) + cos(1.2) - ln(7.6)

5^3 - 22

e^2 - 15*log10(100) + 3*sin(1.8)

When using trigonometric functions (sin, cos, tan, asin, acos, atan) be sure to select the corect mode - Radians or Degrees - from the top of the on-screen keypad.

### Calculating

Once the expression has been enetered press the equal button ("=") or the "Enter" key on the computer's keyboard to calculate the result. The result will be displayed
in the lower text box.

### Extra

Once the result has been calculated you can still use operators or functions on it. For example:

- we input and calculate the expression: 5-3.8

- the result is: 1.2

- if, for example, the "sin" button is clicked the expression becomes: sin(1.2)

etc.

Back to the scientific calculator