Suppose the degree-three Taylor polynomial for a function f(x) centred at x=0 is
4-x+5x^(2)-4x^(3)
and the degree-three Taylor polynomial for a function g(x) centred at x=0 is
5+9x-5x^(2)-8x^(3)
Then the degree-three Maclaurin polynomial for the function f(x)*g(x) is: T_(3)(x)=