HP -15C Advanced Functions Handbook page 27

Section 1: Using | SOLVE | Effectively 25
Based on these samples, try using an extreme estimate of-0.25 and
initial | SOLVE | estimates (in radians) near 10° and 30°.
Display
-0.2500
0.2000
0.6
Error 8
0.4849
0.4698
0.0457
0.0411
0.0411
0.4849
I ENTER |[ENTER |[T|[B] -0.2043
H_ o.oooo
0.4698
Error 8
0.4898
0.4893
0.4898
-0.2043
0.4898
28.0660
28.0660
|ENTER||ENTER||T|rBl
EH]
Stores extreme estimate.
Initial estimates.
No root found.
Stores 0 estimate.
Stores previous 6 estimate.
Distance from extreme.
Revises extreme estimate
by 90 percent of the
distance.
Recalls 6 estimate.
Calculates intensity E.
Recalls other 6 estimate,
keeping first estimate in
Y-register.
No root found.
6 estimate.
Previous 6 estimate.
Recalls 8 estimate.
Calculates intensity E.
Recalls 6 value.
Angle in degrees.
Restores Degrees mode.
The second interation produces two 6 estimates that differ in the
fourth decimal place. The field intensities E for the two iterations
are equal to four decimal places. Stopping at this point, a minimum
field intensity of -0.2043 is indicated at an angle of 28.0660°. (This
angle differs from the previous solutions by about 0.002°.)