Figure 2. Answer on item number 15 written by a student from experimental group (ES3) using co-terminal angles to determine the value of the function

From

The Influence of Mathematical Communication on Students’ Mathematics Performance and Anxiety

Laila S. Lomibao, Charita A. Luna, Rhoda A. Namoco

American Journal of Educational Research. 2016, 4(5), 378-382 doi:10.12691/education-4-5-3