Manual HP 49g graphing calculator (page 136 of 175) (English)

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

command catalog (‚N~„l) or through option 2. LIMITS &

SERIES… of the CALC menu (see above).

Function lim is entered in ALG mode as lim(f(x),x=a) to calculate the

limit

)(lim xf

ax→

. In RPN mode, enter the function first, then the expression

‘x=a’, and finally function lim. Examples in ALG mode are shown next,

including some limits to infinity, and one-sided limits. To calculate one-sided

limits add +0 or -0 to value to the right of the arrow. A “+0” means limit from

the right, while a “-0” means limit from the left. The infinity symbol is

associated with the 0 key, i.e.., „è.

Functions DERIV and DERVX

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 ( „Ö).

Function DERIV requires a function, say f(t), and an independent variable, 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.

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HP 49g graphing calculator Manual

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