Owner's Manual

TI-89 / TI-92 Plus Calculus Tools Page 34
prpendic
(expression, var, varValue)
Returns an expression for the line that is normal to
expression
at
var
=
varValue
.
Use F2 2:Normal Line to display the problem-entry dialog box
and example for this function.
ratioTst
(expression, indexVar)
Conducts the ratio test for the convergence of an infinite
series, returning one of the strings
converges
,
diverges
,
test
inconclusive
, or
unable to complete test
.
Use F4 1:Ratio Convergence Test to display the problem-
entry dialog box and example for this function.
seq1Solv
(p(n), r(n), n, nMin, ui)
Attempts to return an exact symbolic expression for u(n) that
satisfies the linear 1st-order sequence equation
u(n)=p(n)

u(n-1)+r(n) with u(nMin)=ui.
Use F4 2:1st-Order Sequence
to display the problem-entry
dialog box and example for this function.