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Using the scientific calculator key functions
Multiplication:-
Use the multiply button in the calculator keypad. Enter value1 
press 'X' then enter value2 then press the equals '=' button key.
Division:-
Use the divide button in the scientific calculator keypad. Enter value1 press Divide then
enter value2 then the equals '=' key.
Addition:-
Use the addition button in the calculator keypad. Enter value1 press '+' then then the equals '=' key.
Subtraction:-
Use the subtraction button in the scientific calculator keypad. Enter value1 press '-'
then enter value2 then the equals '=' key.
Sin (sine) - Cos (cosine) - Tan
These are all immediate commands and will attempt to act on the immediate value contained within the readout.
Inv (Invert)
This button inverts Sin - Cos - Tan on the next Sin - Cos - Tan function.
Pi button
Inserts the current value of Pi (3.14159) into the readout overwriting the readout contents.
X2 button
An immediate command and will attempt to square to the power two the immediate value within the readout overwriting the readout.
Xn button
This will ask for a value (n) and will attempt to square the readout to the power (n) then place the value in the readout overwriting the readout.
1/x button
This will divide one by the contents of the readout then place the value in the readout overwriting the readout.
Exp button
Inserts the exponential value 'E-' into the readout for the exponential function.
+/- button
Toggles any exponential function 'E-' to 'E+' etc within the readout, else negates any value contained within the readout.
% button
Returns the percentage of the value of the readout, overwriting the readout.
Log button
Returns Log (e) , overwriting the readout.
Ln button
Returns Log (readout), overwriting the readout.
BS button
Back-space function for the readout.
CE button
Clear the scientific calculator readout contents only.
CLR button
Clears all the scientific calculator data areas except the stored memory data.
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