#8. 25
(u/v)`=(u`*v-u*v`)/v^2 u=cos^2x u`=2cosx*(cosx)`=2cosx*(-sinx)=-sin2x v=lg(x^2-2x+1) v`=(1/(x^2-2x+1)*ln10)*(x^2-2x+1)`=(2x-2)/((x^2-2x+1)*ln10)= =2/((x-1)*ln10) О т в е т. (-sin2x*lg(x^2-2x+1)- 2cos^2x/((x-1)*ln10))/lg^2(x^2-2x+1)