alleryStart learning →The derivative of sigmoid(x) equals
Atanh(x)² with no scaling
Bmax(0, sigmoid(x)) elementwise
Csigmoid(x) · (1 - sigmoid(x))
D1 - sigmoid(x)²
Answer & Solution
Correct answer: C. sigmoid(x) · (1 - sigmoid(x))
d/dx sigmoid(x) = sigmoid(x)·(1 − sigmoid(x)).
It reaches a maximum of 0.25 at x = 0 and vanishes as |x| grows — the classic vanishing-gradient source.
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