HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 205
X=A+0resp X=A-0, Constant, PREVAL FX,A,B, FB-FA
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hp40g+.book Page 23 Friday, December 9, 2005 1:03 AM PREVAL Typing: lim⎝⎛-N--S---⋅I---NT----A(--N--N----⋅(--X-X TN---A--⋅--N-S----(I--NN-----(-⋅-X--X--)--)-, 0⎠⎞ gives: 2 NOTE: To find the limit as x approaches a+(resp a-), the second argument is written: X=A+0(resp X=A-0) For the following expression, find the limit as x approaches +∞: x+ x+ x- x Typing: lim⎝⎛ X + X + X - X produces (after a short wait): 1-2 NOTE: the symbol ∞ is obtained by typing SHIFT 0. To obtain To obtain You can also find the symbol ∞ in the MATH key's Constant menu. Evaluate a primitive PREVAL has three parameters: an expression F(VX) dependent on the variable contained in VX, and two expressions A and B. For example, if VX contains X, and if F is a function, PREVAL (F(X),A,B) returns F(B)-F(A). Computer Algebra System (CAS) 14-23