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## Homework Statement

(x=theta for typing here)

*Find exact values of sin2x, cos2x, and tan2x when sec(x)=-6; 90degrees<x<180degrees*

## Homework Equations

sin(2x)=2sinxcosx

etc..

## 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

sin(2x)=(2)((sqr37)/36)(-1/6)

sin2x=(-2sqr37)/36

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