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To evaluate the expression we can use the EVAL function, as follows:
μ„î`
As in the previous example, you will be asked to approve changing the CAS
setting to Approx. Once this is done, you will get the same result as before.
An alternative way to evaluate the expression entered earlier between quotes is
by using the option …ï. To recover the expression from the existing
stack, use the following keystrokes: ƒƒ…ï
We will now enter the expression used above when the calculator is set to the
RPN operating mode. We also set the CAS to Exact and the display to
Textbook. The keystrokes to enter the expression between quotes are the same
used earlier, i.e.,
³5*„Ü1+1/7.5™/
„ÜR3-2Q3`
Resulting in the output
Press ` once more to keep two copies of the expression available in the
stack for evaluation. We first evaluate the expression using the function EVAL,
and next using the function NUM.
Here are the steps explained in detail: First, evaluate the expression using
function EVAL. The resulting expression is semi-symbolic in the sense that there
are floating-point components to the result, as well as a
√3. Next, we switch
stack locations and evaluate using function NUM:
™ Exchange stack levels 1 and 2 (the SWAP command)
…ï Evaluate using function NUM
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