HP 48gII User's Manual
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Page F-6
CAS menu..
Selecting option 11.CAS menu.. in the APPS menu produces the CAS or
SYMBOLIC menu:
This operation is also available by pressing the Pkey. The CAS or
SYMBOLIC menu is introduced in Chapter 5 (algebraic and arithmetic
operations). Other functions from the CAS menu are presented in Chapters 4
(complex numbers), 6 (equations solutions), 10 (matrix creation), 11 (matrix
operation), 13 (calculus), 14 (multivariate calculus), and 15 (vector analysis).