## anonymous one year ago Thanks for helping! I simplified a pre calc problem into cos(x)=1/sqrt(2) From here I'm stuck, as I need to write it in terms of pi. I would really appreciate any help, thanks!

1. anonymous

@Hero @iambatman @Kainui @jim_thompson5910 @ganeshie8 @zepdrix @Nnesha

2. anonymous

Which value of x makes $$cos(x) = \frac{1}{\sqrt{2}} = \frac{\sqrt{2}}{2}$$ ?

3. anonymous

remember the basic cos, sin and tan of 30, 45 and 60 deg?

4. Nnesha

you can't hve the radical sign at the bottom so multiply top and bottom both with square root 2

5. anonymous

yea

6. jim_thompson5910
7. anonymous

oh, wait, I remember this now. Thanks for the help guys!

8. anonymous

No problem ^^