Experts, in the NCERT textbook for Mathematics Class 12, part 1 , chapter 6 (applications of derivatives) pg 209 Example 18 ( Q- Find the equation of the tangent to the curve y= x-7 / (x-2)(x-3) at the point where it cuts the x-axis.) , could you please explain the second step ? that is how did they differentiate y to get dy/dx ?