Special characters are symbols not readily accessible from the keyboard. They can be accessed from the special symbols toolbar.
Division sign, less than, less than or equal to, greater than and greater than or equal to symbols
If the desired symbol is shown, click on it. Otherwise, click on the pull down arrow, select the appropriate symbol and then click on it.
Constants 
If the desired constant is shown, click on it. Otherwise, click on the pull down arrow, select the appropriate constant and then click on it.
Indexed variables 
After you have entered a variable, click on the index button – this will create a space holder for the index value. Usually you will use numbers as indexes (such as x1, y2, etc), but you can also use letters or words (for example, xmax). To exit the index area, press the 
key.
Trigonometric and logarithmic functions 
If the desired function button is shown, click on it. Otherwise, click on the pull down arrow, select the appropriate function and then click on it.
If you try to enter a function by simply typing it in (i.e. if you enter the letters l o g for the log function), the system will interpret each letter as a separate variable. You must enter the function by using one of the function buttons.
When you create a template for a log function, the log base is assumed to be equal to 10. If you require a different base, click on the lower right portion of the log symbol:
and enter the base. You can also reach the log base by using the 
key.
Watch Video
Entering logarithmic expressions
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