funkcja-displaystyle-fx-frac3x-1x24-jest-okreslona-dla-kazdej-liczby-rzeczywistej

A)

$\displaystyle f'(x)= \frac{-3x^2+2x+12}{\left(x^2+4\right)^2}$ \displaystyle f'(x)= \frac{-3x^2+2x+12}{\left(x^2+4\right)^2}

B)

$\displaystyle f'(x)= \frac{-9x^2+2x-12}{\left(x^2+4\right)^2}$ \displaystyle f'(x)= \frac{-9x^2+2x-12}{\left(x^2+4\right)^2}

C)

$\displaystyle f'(x)= \frac{3x^2-2x-12}{\left(x^2+4\right)^2}$ \displaystyle f'(x)= \frac{3x^2-2x-12}{\left(x^2+4\right)^2}

D)

$\displaystyle f'(x)= \frac{9x^2-2x+12}{\left(x^2+4\right)^2}$ \displaystyle f'(x)= \frac{9x^2-2x+12}{\left(x^2+4\right)^2}