Problem 8. [2+2 points] (a) Consider the equation x^2 + z^2 = 1. This equation describes a surface Γ in R^3. Describe in words (as completely and as precisely as possible) what the surface Γ looks like. (b) Consider the curve C in R^3 with parametric equation r(t) = <cos e^t, ln(1 + t^6), sin e^t>. Prove that the curve C lies completely in the surface Γ.