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Consider the parametrization p(t) = (cos(t), sin(t), t) of the helix. - At what times t does this intersect the sphere {(x, y, z) s.t.

Consider the parametrization p(t) = (cos(t), sin(t), t) of the helix.

- At what times t does this intersect the sphere {(x, y, z) s.t. x2 + y2 + z2 = 5}? (i.e. for what values of t is p(t) in the sphere?) Note: there are two intersections.

- Give a linear (constant velocity) parametrization of the tangent line to the helix at one of these points.

- Give a new parametrization of this tangent line with nonconstant velocity.

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