X²+y²-6x+4y+4=0
(x²-6x+9)+(y²+4y+4)=9
(x-3)²+(y+2)²=3²
уравнение окружности (x-x0)²+(y-y0)²=R²
x0 = 3, y0 = -2
(3;-2) - центр окружности
т.А (-5;3)
=√89 ≈ 4.3
A) f'(x) = 3/√(Cos2x) * 1/2√Cos2x) *(-Sin2x) * 2 = --3Sin2x/Cos2x = -3tg2x
б) f'(x) = ( 1/7 * (x-9)^7* Сos2πx)' - (1/πCos³πx/4)'=
= (x-9)^6 * Cos2πx + 1/7 * (x-9)^7 * (-Sin2πx) * (-2) +2Cos^-1 πx/4* (-Sinπx/4 )* π/4.
f'(9) = Cos18π - π/2 Sin9π/4 /Cos9π/4= 1 - π/2
(х-2/10/81х):(х-1/81х)=((х/10-0,2)/81х)*(81х/х-1)=(х/10-0,2)/(х-1), если х=1, то (1/10-0.2)/(1-1)=0
(c-m)^2
(3+c)^2
(9c-2m)
(5c+m^2)