The answer is below.
Work Step by Step
You would plot it against $sin2\theta$. After all, if it were plotted versus theta, it would be a sine curve. Thus, by plotting it against $sin2\theta$, you can get a linear trend.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.