SUM will take the current result in the display and add it to the current value stored in memory. If nothing is in the memory, the current value will be placed in memory as it is. EXC will take the current value in memory and exchange it with the current resultant. The previous current result will be placed back in memory. This is the opposite of squaring the number, seen below.
EE is used for scientific notation.
The square of a number is that same number multiplied by itself. The INV button will reversie the previous three trig functions. If the INV button is pressed, the SIN button will instead calculate the Inverse-Sine. Pointer to newly-created calculator widget. If reset is TRUE , results stored in memory and the calculator mode are cleared also.