4⁻⁶ -16⁻³ 4⁻⁶-(4²)⁻³ 4⁻⁶ -4⁻⁶ 0
----------------- = --------------- = --------------------- = ---------- = 0
64⁻⁵ (4³)⁻⁵ 4⁻¹⁵ 4⁻¹⁵
8х-10=2 корень из х
8х-2 корень из х=-10
8х-4х=-10
4х=-10
х=-2,5
Y=x^3*cosx
y'=(x^3)'*cosx+x^3*(cosx)'=3x^2cosx-x^3sinx
1+cos2x=cosx
1+cos^2x+sin^2x=cosx
cos^2x+sin^2x+cos^2x-sin^2x-cosx=0
2cos^2x-cosx=0
cosx(2cosx-1)=0
cosx=0 2cosx-1=0
x=π/2+πn cosx=1/2
x=+-π/3+2πn;n∈z
ответ: π/2+πn; +-π/3+2πn;n∈Z