Activities 727
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.
3. Use
rref( ) to “row reduce” matrix b:
The result will have the identity matrix in
the first three columns and
a^L1 in the last
three columns.
Note: Use the cursor in the history area to
scroll the result.
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= L70/17
Note:
Use the cursor in the history area to
scroll the result.
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