Learn how to solve calculus differentiation problems using the First Principle method in this 12-minute video tutorial. Focus on differentiating the function y=x(x²+3) step-by-step using the First Principle approach. Gain a deeper understanding of this second method of differentiation, building upon knowledge of the General Method. Perfect for students preparing for calculus exams or those looking to strengthen their mathematical skills. Explore the concepts of limits, substitution, and function analysis as applied to first principle differentiation.