limit tends to x---3 [1/x-3] - [3/ x (x^2 - 5x + 6)]
here x-3 is fully in denominator and x (x^2 - 5x + 6) is also in denominator
limit tends to x---3 [1/x-3] - [3/ x (x^2 - 5x + 6)]
here x-3 is fully in denominator and x (x^2 - 5x + 6) is also in denominator