In this video, we differentiate the function y = ln ( 1 x 2 ) cos x y= cosx ln( x 2 1 ) using logarithmic laws alongside the Quotient Rule and Chain Rule. The solution is presented step by step to help students clearly understand the method and application of differentiation rules. This lesson is ideal for students preparing for WAEC, NECO, A-Level, JAMB, and introductory university calculus.