Critical Points Calculator

Find the critical points of a function f(x) by computing its derivative and solving f'(x) = 0.

Notes:

Critical points occur where f'(x) = 0 or f'(x) is undefined.
Use the second derivative to classify points as maxima, minima, or saddle points:
- f''(x) > 0 → local minimum
- f''(x) < 0 → local maximum
- f''(x) = 0 → inconclusive

Enter the function using standard notation. Only single-variable functions (x) are supported.