fx-82MS fx-82TL fx-9860GII TI-83
ln
On a Casio calculator you can calculate natural logarithms
ln
Example 1
To calculate ln (1) = 0
ln 1 = ln 1
0.
Example 2
To calculate ln (e) = 1
ALPHA e˟ e
ln ln = ln e
1.
Example 3
To calculate ln (e2) = 2
SHIFT e˟ ln ln 2 = ln e2
2.
Example 4
To calculate ln (√7) = 0,97295...
ln √ 7 = ln(√7
0.972955074
because ln (√7) = ½ ln (7) = 0,97295...
1 ab/c 2 ln 7 = 1┘2ln(√7
0.972955074
Example 5
To calculate eln (7) = 7
SHIFT e˟ ln ln 7 = eln 7
7.
and this demonstrates the definition of the logarithm.
Details
The functions ln, ex and e are on the same key. This makes sense because these functions all deal with the number e.