# Help to isolate θ

• Mar 30th 2011, 08:26 PM
xbethx
Help to isolate θ
Isolate θ

cos 2θ = cos y cos x

I have no clue where to start, some help would be great.

Nvm i figured it out
• Mar 30th 2011, 08:30 PM
pickslides
Take inverse $\cos$ of both sides then divide by 2.

What do you get?