TI-92 Tutorial Answers
Key -> Sequence Joy
pad:Option
1) Clean the machine From the home
window
Diamond -> q
F1:Clear Home erases all expresions in the Home
window.
F6:Clear a-z Enter removes all 1 letter
variables.
Diamond -> Y = to enter the function editor, then
F1:Clear
Functions -> Enter will remove all functions
in the Y = editor.
2) Substitution and approximation From
the home window Diamond -> q
Key in the function with the following.
xÙ2/3-8Ö(6yÙ3)
Continue that line and make the substitutions with the following.
xÙ2/3-8Ö(6yÙ3)|
x=6 and y=1/3
Evaluate with Enter. Approximate with Diamond
-> Enter
3) Solving for a variable From the home
window
Diamond -> q
Use F2:solve( or type in solve(xÙ2/3-8Ö(6yÙ3)=0,y)
followed by
Enter
4) Solving a system From the home
window
Diamond -> q
solve(4x-3y=2 and xÙ2/4-yÙ2/9=1,
{x,y})
Or find the x coordinates with solve(4x-3y=2,y) followed
by solve(xÙ2/4-yÙ2/9=1,x)|
y=2(2x-1)/3
Find the corresponding y coordinates with
y=2(2x-1)/3 | x=-2(9*Ö(21)+16)/17
and
y=2(2x-1)/3 | x=-2(9*Ö(21)+16)/17.
5) Graphing a Euclidean system From the
home
window
Diamond -> q
Set the graphing mode to sketch Euclidean Â2
space by MODE:Graph:FUNCTION.
Then, solve the hyperbola for y using
solve(xÙ2/4-yÙ2/9=1,y).
Use the
JoyPad to highlight the solution and copy it
to the buffer with F1:Copy.
Move it to the Y = editor with Diamond -> w
and paste the solution to y1(x) with F1:Paste.
Use the JoyPad and the ¬
to set y1(x)=-3Ö(xÙ2-4)/2
and paste again and edit to set y2(x)=3Ö(xÙ2-4)/2.
Either cut and paste or use the JoyPad to set y3(x)
= 2(2x-1)/3.
Plot them all with
Diamond -> r.
Use F3 to set the trace mode and the JoyPad
to control the trace cursor.
You can also use F2 to choose zoom options.
6) Derivatives and critical points From
the home window
Diamond -> q
Either use F3:d( or 2nd -> 8
to type in
d(a*xÙ3+b*xÙ2+c*x+d,x,2)followed
by Enter.
Enter in solve(d(a*xÙ3+b*xÙ2+c*x+d,x)=0,x)
followed by Enter.
7) Indefinite and definite integrals
From the home window
Diamond -> q
Either by F3:ò( or
2nd
-> 7 to type in ò(yÙ2
tan-1(y),y) followed by Enter.
Multiple integrals are handled by nesting, so the innermost integral
is ò(rÙ2
sin(q),r,0,1)
which means that the double integral is evaluated as
ò(ò(rÙ2
sin(q),r,0,1),q,p/4,p/3)
followed
by Enter.
8) Limits From the home
window
Diamond -> q
Either use F3:limit( or type in
limit((xÙ2-x-6)/(xÙ3-27),x,3)
followed by Enter.
There's no need to use limits on infinite integrals, so ò(1/(x*ln(x)),x,1,¥)followed
by Enter.
9) Parametric and polar curves
Set the graphing mode to sketch Parametric Â2
space by MODE:Graph:PARAMETRIC.
Enter the Y = editor with Diamond -> w
and set x(t1)=3 cos(t) and y(t1)=5 sin(t).
Open up the graphing window parameters with Diamond ->e
and set tmin=-p/2 and tmax=p/2.
Graph the curve with Diamond -> r.
Set the graphing mode to sketch Polar Â2
space by MODE:Graph:POLAR.
Enter the Y = editor with Diamond ->w
and set r1=3/cos(2 q).
Graph the curve with
Diamond -> r.
10) Graphing Euclidean Â3
surfaces
Set the graphing mode to sketch Euclidean Â3
space by MODE:Graph:3D.
Enter the Y = editor with Diamond ->w
and set z1=xÙ2-yÙ2.
Set the graphing display with F1:Format:Style:WIRE AND CONTOUR.
Graph the surface with Diamond -> r.
Use of the JoyPad will rotate the surface in space.
11) Solving and graphing differential equations
From the home window Diamond -> q
Use F3:deSolve( or just type in
deSolve(y'=1/1000
y*(100-y),t,y) followed by Enter.
To find the constant @n, use F4:Define
to set the function Define y=100*eÙ(t/10)/(eÙ(t/10)+100*@n).
Then solve(y=10,@n) | t=0. To code the @
symbol, use the 2nd:Char:Punctuation:@ menu path.
Set the graphing mode to sketch Differential Equations Â2
space by MODE:Graph:DIFF EQUATIONS.
Enter the Y = editor with Diamond ->w
and set t0=0, y1'=.001*y1*(100-y1), and
yi1=10.
Set the graphing display with F1:Format:Fields:SLPFLD.
Graph the surface with Diamond -> r.
File translated from TEX by TTH,
version 2.32.