Question

Dear Sir plz tell me about second order derivative test​

Answer 1

Step-by-step explanation:

The second derivative may be used to determine local extrema of a function under certain conditions.

If a function has a critical point for which

f′(x) = 0 and the second derivative is positive at this point,

then f has a local minimum here. ...

This technique is called Second Derivative Test for Local Extrema.