(15ab²+5a²b)-(2a+6b)=5ab(3b+a)-2(a+3b)=(3b+a)(15ab-2)
f(x) = ctg3x/3
f'(x) = -(3x)'/3sin^2 (3x) = -3/3sin^2 (3x) = -1/sin^2 (3x)
f'(x0) = f(-π/6) = -1/sin^2 (3(-π/6)) = -1/sin^2 (-π/2) = -1/1 = -1
Ответ : -1
<span>2(4y-1)-5y<3y+5</span>
<span>8y-2-5y-3y-5<0</span>
<span>-7<0</span>
y - любое
6-6y-24y-8+30y+5.>0
5>0
y-любое