/;/щ ХО 1
v(t)=s`(t)=((1/4)t^4+t^2+3t)`=t^3+2t+3 v(3)=3^3+2*3+3=36 a(t)=v`(t)=(t^3+2t+3)`=3t^2+2 a(3)=3*3^2+2=29