S(t) = 1 + 1/3 t³ - 12t
V(t) = S' = t² -12, V(1) = 1² - 12 = -11
a(t) = V ' = 2t , a(t) = 2*1 = 2
1) y'=(3x+x^3)' (x-2) + (3x+x^3) (x-2)' = (3+3x^2)(2-x)+ 3x + x^3 = 6 -3x + 6x^2 - 3x^3 + 3x + x^3 = - 2x^3 + 6x^2 + 6
Y^3+(5-y)(25+5y+y^2)=y^3+5^3-y^3=5^3=125