TI-83 Plus Activities 585
3. Press o. Turn off all functions and stat plots. Enter the numerical
integral of 1àT from 1 to X and the function ln(X). Set the graph style
for Y1 to ç (line) and Y2 to ë (path).
4. Press r. Press |, }, ~, and † to compare the values of Y1
and Y2.
5. Press o. Turn off Y1 and Y2, and then enter the numerical derivative
of the integral of 1àX and the function 1àX. Set the graph style for Y3
to ç (line) and Y4 to è (thick).
6. Press r. Again, use the cursor keys to compare the values of the
two graphed functions, Y3 and Y4.