F = <-y^2, x, z^2>. Let C be the curve parameterized by r(t) = <cos t, sin t, 0>, 0 <= t <= 2pi. a) Compute int_C F * dr b) Evaluate int_C F * dr by using Stokes' Theorem where S is the top of the sphere x^2 + y^2 + z^2 = 1. c) Evaluate int_C F * dr by using Stokes' Theorem where S is z = 1 - x^2 - y^2.