B²/(4a-7b)(4a+7b) * (4a-7b)/b =b²*(4a-7b) /(4a-7b)(4a+7b)*b =b/(4a +7b) =8/9 :(8/3 +56/9) =8/9 : (24+56)/9 =8/9 : 80/9 =8/9 * 9/80 =8*9/9*80 =8/80 =1/10 =0.1
Tgα=y'(x0) x0=-1
y'(x)=3x^2+2x
y'(x0)=3-2=1
tgα=1
Находим производную 2е^(2x)-2x, правниваем к нулю х = -е^(2x)