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d/dx
calculus · derivative operator
The derivative — instantaneous rate of change.
Applied to f(x) = x², it returns 2x — the slope of the curve at any point.
d = "an infinitesimal change in"  ·  dx = "with respect to x". The whole notation asks: as x moves by an infinitely small amount, by how much does f move?
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Context · Calculus · Derivatives
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