Question

If cos2x= -7/18, find cotx for 3pi/2 < x < 2pi

Answer 1

\[\huge \cos 2x=-\frac{7}{18}\]
\[\huge 2x=112`53', 247`7', 472`53',607`7' \]
\[\huge x=56`27', 123`33', 236`27', 303`33'\]
the ` symbol represents the degree sign. Don't have that symbol on my laptop.
Now you can find cotx, by substituting the x-values and getting answers that range from your restriction.