fx-82MS fx-82TL fx-9860GII TI-83
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On a Casio calculator you can start a calculation
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Whenever you press this key after inputting values or an expression, the calculated result automatically updates answer memory contents by storing the result. A calculation is a tautology. In mathematics, this means that at the left and right of the equal sign (=) the same is stated.
Example 1
To calculate 
1 a b/c 2 + 1 · 6 = 1 ┘2+1.6
2.1
Example 2
To calculate 5 × −2 = −10
5 × (−) 2 = 5×-2
-10.
Example 3
To calculate sin (90°) = 1
sin 9 0 = sin 90
1.