### Home > A2C > Chapter 13 > Lesson 13.1.3 > Problem 13-56

13-56.

For each of the following problems, find all of the solutions without using a calculator. Use a graph or unit circle to support you answers. Then predict the solution that your calculator will give and use your calculator to check your prediction. Homework Help ✎

See part (a).

See part (a).

cos^{2}(*x*) = 1

*x* = π*n*