Find the coefficient of x3x^3x3 in the Taylor series of f(x)=excos(x)f(x) = e^x \cos(x)f(x)=excos(x) centered at x=0x = 0x=0.
−13-\frac{1}{3}−31
13\frac{1}{3}31
−16-\frac{1}{6}−61
12\frac{1}{2}21