(a-2)²-(a+5)²=(a-2-a-5)(a-2+a+5)=-7*(2a+3)=-14a-21
При а=-1,2
-14(-1,2)-21=16,8-21=-4,2
1) 203^2-406*103+103^2 41209-41818+10609=10000 2) 1,58^2+1,58*2,84+1,42 2,4964+4,4872+1,42=8,4036
-26cos(3п/2 -α ) =-26*(-cos α) = 26 * cos α
26 * (-5/13) = -10
<span>y=1/3x^3-2x^2</span>
<span>y' = x^2 - 4x</span>
<span>x^2 - 4x = 0</span>
<span>x(x-4) = 0</span>
<span>x = 0 и х = 4</span>
y(0) = 0
y(4) = 1/3*64 - 2*16 = -32/3
точки (0;0) и (4;-32/3) - экстремумы функции