Patrick uses a calculator to find tan 25 and reports that it is about 0.4663. Sandra does the same with her calculator but she states that tan 25 is about
-0.1335. I claim that they both may be wrong but they can't both be correct.
Write out below your answers to the following questions.

1. Without checking their work with my own calculator, why is it that I
know they can't both be correct? Hint: tangent is a function.

2. I have checked and one of them is correct, who is correct?

3. Explain what the person who got in wrong did. What was the mistake?