Find parametric equations for the tangent line at the point (cos(), sin(4), 4) on the curve x = cos t, y = sin t, z = t x(t) = cos(2pi/6)+t(-sin(2pi/6)) y(t)= cos(2pi/6)t+sin(2pi/6)t z(t)= t+(2pi/6) (Your line should be parametrized so that passes through the given point at t=0).