a. Find the parametric equations for the surface generated by revolving the curve y = sin x about the x-axis.

7. a. Find the parametric equations for the surface generated by
revolving the curve y = sin x about the x-axis.

b. Using the parametric equations from part a. set up but do NOT
evaluate an integral that will give the surface area of that portion of
the surface for which 0 ≤ x ≤ π.

c. . Find the equation of the tangent plane to the parametric surface
in part a. at the point (x, y, z) = (pi/6, 1/2, 0)