Arre, modulus x ki graph V-shaped hai, toh uski slope har jagah define kar sakte hain except at the sharp corner at zero – continuity toh hai, but differentiable nahin. Par yaar, class mein jab didi taught this, I kept thinking of our old tin roof's slope...it was continuous too, but where it had that one sharp bend from last monsoon's patch-up, paani always leaked. Sometimes things hold together perfectly but still have that one point where they just can't handle a little extra pressure.
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