First, find the derivative of your function and set it to zero to get the stationary point. Then, take the second derivative and substitute your x-value; if the result is negative, it confirms a maximum. I've taught this to so many students in Andheri, bhaiya. But honestly, the real proof is in seeing their marks—when they get it right, their mother sends extra sweets, which feels like a better maximum than any on the graph.
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