Originally Posted by

**flashylightsmeow** Hi there, I was wondering if someone would be able to help me solve this equation :

cos(x+TT/6) + cos(x-TT/4) = 0

It's driving me insane. I use compound angle theorem to expand the components and end up with:

$\displaystyle \sqrt{3}/2\cos{x}-1/2\sin{x}+1/\sqrt{2}cos{x}-1/\sqrt{2}sin{x}=0$

I then tried squaring both sides and using trig identities to put everything in terms of $\displaystyle cos^2{x}$. And got something that I wont waste your time with. Please help!