А) f(x)=2x^5-4x^3 в) f(x)=1/4x^3*ctgx^2 б) f(x)=sinx-2x^3 г) f(x)=2x|x|-3x

а) (f(x))\' = (2x^5 - 4x^3)\' = (2x^5)\' - (4x^3)\' = 10x^4 - 12x^2;

б)  (f(x))\' = (1 / 4x^3 * ctg(x^2))\' = (1 / 4x^3)\' * ctg(x^2) + 1 / 4x^3 * (ctg(x^2) = -3/4 * x^(-4) + 1 / 4x^3 * ( -1 / sin^2(x^2)) * 2x.

в) (f(x))\' = (sin(x) - 2x^3)\' =  (sin(x))\' - (2x^3)\' = cos(x) - 6x^2.

г) (f(x))\' = (2x|x| - 3x)\' = 2|x| +- 2x - 3.