hello, could anyone help me solve the problem of ?(2)cos(2x)=1
The square root is over the 2 if it is hard to read.
I know the answers is pi/8, 7pi/8, 9pi/8. and 15pi/8, but i do not know how to get there. My attempts at using the double angle of cosine never seem to work.
Any help would be appreciated.
The square root is over the 2 if it is hard to read.
I know the answers is pi/8, 7pi/8, 9pi/8. and 15pi/8, but i do not know how to get there. My attempts at using the double angle of cosine never seem to work.
Any help would be appreciated.