Find the points on the lemniscate where the tangent is horizontal. 2(x2 + 2)2 = 81(*2 - >2) (x , y) = (smaller x-value, smaller y-value) (x, y) = (smaller x-value, larger y-value) (x, y) = (larger x-value, smaller y-value) (x, y) = (larger x-value, larger y-value)