HP 49g manual Including some limits, Infinity symbol is associated with Key, .e

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Functions DERIV and DERVX

where the limit is to be calculated. Function lim is available through the

command catalog (	)			or through	option 2. LIMITS &
SERIES… of the CALC menu (see above).
Function lim is entered in ALG mode as						to calculate the
			lim(f(x),x=a)
limit lim f (x) . In RPN mode, enter the function first, then the expression
x→ a
‘x=a’, and finally function lim. Examples in ALG mode are shown next,
including some limits	to	‚N~„linfinity.
The infinity symbol is associated with the				key, .e..		.

Function DERIV requires a function,„Ösay f(t),0and an independent„èvariable, say, t, while function DERVX requires only a function of VX. Examples are shown next in ALG mode. Recall that in RPN mode the arguments must be entered before the function is applied.

The function DERIV is used to take derivatives in terms of any independent variable, while the function DERVX takes derivatives with respect to the CAS default variable VX (typically ‘X’). While function DERVX is available directly in the CALC menu, both functions are available in the DERIV.&INTEG sub-

menu within the CALCL menu ( ).