5sine(2x)=2
or sine(2x)=0.4
take invers sine tu get 2x=23.57817848 deg
so x=11.78908924
sine is periodik...get same anser if add or subtrakt n*2*pi
weer n=0, 1, 2, 3, 4,...
#### also: sine(180-x)=sine(x), so nuther anser is 180-11.78908924
& 2npi* added tu that