Evaluate the line integral F · dr, where C is given by the vector function r(t). F(x,y,z) = sin(x)i + cos(y)j + xzk r(t) = t^4i - t^3j + tk, 0 ≤ t ≤ 1 Evaluate the line integral F · dr, where C is given by the vector function r(t). F(x, y, z) = (x + y)i + (y - z)j + z^3k r(t) = t^2i + t^3j + t^2k, 0 ≤ t ≤ 1