Sharp EL-9600 User Manual page 83

NAME _____________________________________________________ CLASS __________ DATE __________
8.2
LAW OF COSINES
Use the Newton Solver with the Law of Cosines.
1. Access the SOLVER with 2ndF
in the SOLVER). Press CL to delete the current equation. Return to the
Equation Solver by pressing 2ndF
double touch 1 Equation.
2. Next enter the Law of Cosines by pressing ALPHA
ALPHA X
Y cos
3. Store this equation in the calculator.
4. Given a triangle in which two sides of lengths 13 cm and 8 cm enclose a 50°
angle. Find the length of the third side.
5. Press ENTER to view the list of variables. Press
on X and enter 13. Next, enter 8 for Y and 50 for . Press
cursor over Z and press 0
6. Press 2ndF
changed to the Newton Solver. You should supply an initial estimate of the
solution in the START position (0 is the default value) and a step size STEP
(.001 is the default value).
7. Press 2ndF
changing the START value or increasing the STEP value.)
8. Notice the left and right sides of the equation are displayed as equal values,
and the L – R = 0.
SOLVER (or press CL twice if you are still
2
x + ALPHA Y
ALPHA .
ENTER .
EXE to solve for Z. Notice that the SOLVER has automatically
EXE to find the solution. (If you receive an error message, try
Blackline Masters/TRIGONOMETRY USING THE SHARP EL-9600
SOLVER , touch A METHOD, and
Z
2
x – 2 ALPHA
to position the cursor
2
x ALPHA =
X ALPHA
to move the
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