The Most Arbitrary Wizard

This is an iron chain forged from Magic Power. You cannot break free using brute force. But it's okay, you are also a Wizard; you try to defeat Magic with Magic. But you failed. You have no choice but to re-examine the iron chain, only to discover that it is composed of faintly glowing letters, linked by many symbols that you recognize individually but are completely incomprehensible when put together, ultimately forming a series of inequalities. Your intuition tells you that the key to breaking the magical shackles is to solve these inequalities. But the problem is... 【if...f'(x) ≥ 1/4, f(2) ≥ 0, x ≥ 3...max{f(x)} = ?】 “???” “Who the hell uses Magic this way?!” — Description from novelcodex.org