Exploring cos(x) = sin(x) – Texas Instruments TITANIUM TI-89 User Manual
Page 748
Activities
748
Exploring cos(x) = sin(x)
Exploring cos(x) = sin(x)
Exploring cos(x) = sin(x)
Exploring cos(x) = sin(x)
This activity uses two methods to find where
cos(x) = sin(x)
for the values of
x
between 0
and 3p.
Method 1: Graph Plot
Method 1: Graph Plot
Method 1: Graph Plot
Method 1: Graph Plot
Perform the following steps to observe where the graphs of the functions
y1(x)=cos(x)
and
y2(x)=sin(x)
intersect.
4. Solve for the value of
x
that will cause the
inverse of the matrix to be invalid.
Enter:
solve(getDenom(
2 ±
[1,4] )=0,x)
Result:
x=
L
70/17
Note:
Use the cursor in the history area to
scroll the result.
1. In the
Y= Editor
, set
y1(x)=cos(x)
and
y2(x)=sin(x)
.
2. In the
Window Editor
, set
xmin=0
and
xmax=3
p.
3. Press
„ and select
A:ZoomFit
.