3 cos2x - 14 cosx + 7 = 0
<span>3 cos2x - 14 cosx = -7 </span>
<span>cos(x)(3cos(2)-14)=-7 </span>
<span>-11.001827cos(x)=-7 </span>
<span>cos(x)=-7/-11.001827 </span>
<span>cos(x)=0.636258 </span>
<span>x=50.489</span>
2x+1/3 - 4x-2/4= 1 -2x-1/6=1 -2x=1/6 x=-1/12
1/(3х-1)=х/(27-х) х≠27 х≠1/3
27-х=3х²-х
3х²=27
х²=9
х₁=3 х₂=-3