Sharp EL-9600 User Manual page 17

For Discussion
Students can use the calculators to discuss how "toggling" (using the
keys while tracing) between Y1 and Y2 verifies the same values for both Y1
and Y2, and they can explore what happens when they do not limit the domain
on those problems with ± parts (they see two graphs).
Additional Problems
Verify the following formulas and identities graphically.
1. cos 2 = cos
2
2. 1 + cot = csc
2 2
3. sin cot
Graphical Verification of Formulas and Identities/TRIGONOMETRY USING THE SHARP EL-9600
2 2
– sin
2
= (1 + sin )(1 – sin )
and
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