Find all solutions of the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.)

Question

2 cos θ − 1 = 0

Answer 1

solve for cosθ the way you would for any other variable.

2cosθ = 1
cos θ = 1/2

ta da. Of course, now you have to now how to find θ, but that's no problem, right?

Answer 2

Find the real solutions of the equation. (Round your answers to three decimal places. Enter your answers as a comma-separated list.)
3.4x4 − 1.9x2 = 2.2