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7(а+в)²-14ав=7а²+14ав+7в²-14ав=7а²+7в²............2 вариант.ВиD
-6x^2-x+5=0 *(-1)
6x^2+x-5=0
D= 1+120=121
x1= -1+11/12= 5/6
x2= -1-11/12= -1
Сумма = -1+5/6= -1/6
<span>a) y=sin(3x+2)
y' = 3Cos(3x +2)
b) y=cos(2x-3)
y' = -2Sin(2x -3)
c) y=tg(5x+6)
y' = 5/Cos</span>²(5x +6)<span>
d) y=ctg(4x-3)
y' = -4/Sin</span>²(4x -3)