Lim h tends to 0 (x + H) ^ 3-x ^ 3 / h (i.e. denominator is h and molecule is (x + H) ^ 3) to find the limit, please write down the process,

Lim h tends to 0 (x + H) ^ 3-x ^ 3 / h (i.e. denominator is h and molecule is (x + H) ^ 3) to find the limit, please write down the process,

Lim h tends to 0 [(x + H) ^ 3-x ^ 3] / h
=Lim h tends to 0 [3x ^ 2 * H + 3x * H ^ 2 + H ^ 3] / h
=Lim h tends to 0 (3x ^ 2 + 3xh + H ^ 2)
=3x^2