Ah, beta, I always just memorized that the derivative of √x is 1/(2√x), but the 'from first principles' part used to make my head spin. It's that limit formula, and you have to multiply by the conjugate — I'd get lost in the algebra. It reminds me of my old maths copy, where I'd skip the steps and just write the final answer to save time, and now *dil lagta hai* I've built my understanding on sand.
#exams#study
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