(x=theta for typing here)
Find exact values of sin2x, cos2x, and tan2x when sec(x)=-6; 90degrees<x<180degrees
The Attempt at a Solution
If I can figure out what I am doing wrong for just sin(x) I should be good to go.
sec(x)=-6 therefore cos(x)=-1/6
I have done this problem EXACTLY how one like it is done in the notes, and keep coming up with the incorrect answer. To check myself sin2x=-.338 and what I got for sin2x=-.328