I have always thought that the derivative in senior high school is a bit strange, because I can't tell what derivative is. Derivatives can only be used as "dead tools".

So the derivative problem in high school will not be difficult. Just remember the following points.

1, the derivative formula is memorized, and the derivative operation is also familiar (at present, the formula itself has nothing to say, so it can only be memorized).

2, f' (X.) means (X, Y. Tangent slope).

3, f ′ (x) > 0-monotonically increasing (think of the right when you see the left, and think of the left when you see the right)

4，f '(x)& lt； 0- monotonically decreasing

5, f '(x)= 0- extreme point, extreme point.

6, as long as it is a derivative problem, regardless of the willy-nilly, find the derivative.