### Home > A2C > Chapter Ch11 > Lesson 11.2.1 > Problem 11-45

11-45.

Use reference angles, the symmetry of a circle, and the knowledge that

cos(*π*) = −1

Now come up with your own examples.

11-45.

Use reference angles, the symmetry of a circle, and the knowledge that

cos(*π*) = −1

Now come up with your own examples.