1.

2 2 The equation r(t) = [7t] i + [711612] j is the position of a particle in space at time t. Find the angle between the velocity and acceleration vectots at time t= 0. The angle between the velocity and acceleration vectors at time t : 0 is radians (Type an exact answer, using 1': as needed.) Find parametric equations for the line that is tangent to the given curve at the given parameter value. r(t) = (5 sin t) i + (t