HP 48gII - Manual (Page 86)

Page 2-28
To select the sub-expression of interest, use:
™™™™™™™™‚¢
™™™™™™™™™™‚¤
The screen shows the required sub-expression highlighted:
We can now copy this expression and place it in the denominator of the LN
argument, as follows:
‚¨™™… (27 times) … ™
ƒƒ… (9 times) … ƒ ‚¬
The line editor now looks like this:
Pressing ` shows the expression in the Equation Writer (in small-font format,
press the @BIG C soft menu key):
Press ` to exit the Equation Writer.
Creating and editing summations, derivatives, and integrals
Summations, derivatives, and integrals are commonly used for calculus,
probability and statistics applications. In this section we show some examples
of such operations created with the equation writer. Use ALG mode.
Summations
We will use the Equation Writer to enter the following summation:
∑
∞
=1
2
1
k
k