Please help to solve the following:

1) Find an equation of the set of all points whose distance from the point A(1, -2, 1) is twice the distance from point B(-1, 2, 3). Describe the set.

2) Find the parametric equations for the tangent line to the curve

x = 1 + tsin(t), y = tcos(t), z = sin(t)

at point (1+(/2), 0, 1)