First derivative test is inconclusive if derivative has ambiguous sign around the point
Channel: Vipul's Classroom
Date: 2013-05-09

Video created by Ruinan Liu and Vipul Naik. Based on content at http://calculus.subwiki.org/wiki/First_derivative_test_is_inconclusive_for_function_whose_derivative_has_ambiguous_sign_around_the_point