8x²(-5x-8)(8x²-8)= -8*8x²(5x+8)(x²-1)= -64x²(5x+8)(x²-1)
или более подробно:
8x²(-5x-8)(8x²-8)= (-40x³-64x²)(8x²-8)= -320x^5+320x³-512x^4+512x²= -320x³(x²-1)-512x²(x²-1)= (x²-1)(-320x³-512x²)= -64x²(x²-1)(5x+8)
AB=BD+CD+AC => AC=AB-(BD+CD) AC= 9,2-(1,9+6,3) =1 CM
√2cos²x=cosx
√2cos²x-cosx=0
√2*cosx(cosx-√2/2)=0
cosx=0
x=π/2+π*n
cosx-√2/2=0
cosx=√2/2
x=+-π/4+2π*n
Б) [-7*π/2; -2π]
x=-7π/2
x=-3π
x=-2π
x=-π/4-2π=-9π/4
y=4-x. подставляем в 1 уравнение системы: x^2-(4-x)=2 ; x^2+x-4-2=0; x^2+x-6=0; D=1^2-4*1*(-6)=1+24=25; x1=(-1-5)/2, x2=(-1+5)/2. x1= -3, x2=2. y1=4-(-3)=4+3=7. y2=4-2=2. Ответ:( -3: 7), (2: 2).
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