"if cos 2x = 7/25 and 0<x<2pie find exact values of cosx and sinx"
I have this so far.
cos 2x= 7/25
since cos2x = 2cos^2x-1 then
2cos^2 x-1 = 7/25
2cos^2 x = 7/25 + 1 = 32/25
cos^2 x = 32/50
its going from there to the last step,how do I get rid of the square on the left hand side the SQa marking says cos x = 4/5 and sin x = 3/5 but I can't get it to come out right

thanks peepsies <3