Physics Problem! Help Me!!!!!?

The position r→ of a particle moving in an xy plane is given by with r→=(2t^3-2t){\hat i}+(3-2t^4){\hat j} in meters and t in seconds. What is the angle between the positive direction of the x axis and a line tangent to the particle's path at t = 3 s? Give your answer in the range of (-180o; 180o].