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Differentiate y·(1 - y)

\frac{d^2}{dy^2}\left[y \left(1 - y\right)\right]

Step by step

  1. \frac{d}{dy}\left[y \left(1 - y\right)\right]

    Differentiate 2 times, one derivative at a time.

  2. y \frac{d}{d y} \left(1 - y\right) + \left(1 - y\right) \frac{d}{d y} y

    Product rule with u = y and v = 1 - y: (uv)′ = u′v + uv′.

  3. y \left(\frac{d}{d y} 1 + \frac{d}{d y} \left(- y\right)\right) + \left(1 - y\right) \frac{d}{d y} y

    Sum rule: differentiate term by term.

  4. y \frac{d}{d y} \left(- y\right) + \left(1 - y\right) \frac{d}{d y} y

    The derivative of a constant is 0.

  5. - y \frac{d}{d y} y + \left(1 - y\right) \frac{d}{d y} y

    Constant multiple rule: pull the constant out.

  6. 1 - 2 y

    d/dx of x is 1.

  7. f^{(1)}(y) = 1 - 2 y

    That is derivative number 1.

  8. \frac{d}{d y} 1 + \frac{d}{d y} \left(- 2 y\right)

    Sum rule: differentiate term by term.

  9. \frac{d}{d y} \left(- 2 y\right)

    The derivative of a constant is 0.

  10. - 2 \frac{d}{d y} y

    Constant multiple rule: pull the constant out.

  11. -2

    d/dx of x is 1.

  12. f^{(2)}(y) = -2

    That is derivative number 2.

Reveal the answer
f''(y) = -2