Найдите множество решений системы неравенств "система": √x^2-7> 3; |2-3x|≤13

{√(x²-7)> 3⇒x²-7> 9⇒(x²-16)> 0⇒(x-4)(x+4)> 0⇒x< -4 u x> 4 {|2-3x|≤13⇒-13≤2-3x≤13⇒-15≤-3x≤11⇒-3 2/3≤x≤5 \\\\\\\\\\\\\\                                        ///////////////////////////////// 2/                           \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ x∈(4; 5]

1) y=sqrt(1-x^2)

      y' =1/(sqrt(1-x^2))*(-x)=-x/sqrt(1-x^2)

 

2) y=ln(1+cos(x))

      y'=(1/(1+cos(x))*(-sin(x)=-sin(x)/(1+cos(x))