Find the slope of the tangent line to the curve x=cos(t),y=sin(t),z=tx = \cos(t), y = \sin(t), z = tx=cos(t),y=sin(t),z=t at t=π/4t = \pi/4t=π/4.
(−1/2,1/2,1)(-1/\sqrt{2}, 1/\sqrt{2}, 1)(−1/2,1/2,1)
(−1,1,2)(-1, 1, \sqrt{2})(−1,1,2)
(−1,1,0)(-1, 1, 0)(−1,1,0)
(0,1,1)(0, 1, 1)(0,1,1)