1. Start by substituting another variable (like y) for 2x and solve like we have before, BUT you must include all answers in the specified domain

2. Then set each answer = to 2x

3. We only want answers in the specified domain (double check to make sure you have all possible solutions)

Example 1) Solve for all 𝛉 in degrees. Answers must be exact!

2cos 2

2

Example 2) Solve for 𝛉 in degrees for [0,360°). Answers must be exact!

tan2 1

Example 3) Solve for all x in radians. Answers must be exact!

3cos

2 2

x

Example 4) Solve for x in radians for [0, 2π). Answers must be exact!

1sin3 2

x

Example 5) Solve for θ in degrees for [0°,360°). Answers must be exact!

22sin 2 1

Example 6) Solve for x in radians for [0,2π). Answers must be exact!

2cos3 1 0x