1) 2 cos 3 x = $sqrt{3}$
2) (2/5) $x^{x ^{2} -5+6}$ <1

$1); ; 2cos3x=sqrt3cos3x=frac{sqrt3}{2}3x=pm frac{pi}{6}+2pi n,; nin Zx=pm frac{pi}{18}+frac{2pi n}{3}; ,; nin Z$

$2); ; frac{2}{5}x^2-5+6 textless 1frac{2}{5}x^2 textless 0; ; net; reshenij; ,; t.k.; x^2 geq 0$

3) $(frac{2}{5})^{x^2-5x+6}<1;1=(frac{2}{5})^0$

$x^2-5x+6 textgreater 0x_1=2,x_2=3+++(2)---(3)+++xin(-infty, 2)cup(3,+infty)$