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!

Question

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!

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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

nnesha · Answer

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

anonymous · Answer

yea

jim_thompson5910 · Answer

this unit circle may help http://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Unit_circle_angles_color.svg/1024px-Unit_circle_angles_color.svg.png

anonymous · Answer

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

anonymous · Answer

No problem ^^