1. turunan pertama fungsi f(x) = [tex]4 \div \sqrt{(4x + 1)} \: adalah...[/tex]

[tex] \frac{d}{dx} f(x) = 4 \frac{d}{dx} (4x + 1)^{ - \frac{1}{2} } [/tex]
[tex] = 4( - \frac{1}{2} )(4)(4x + 1)^{ - \frac{1}{2} - 1 } [/tex]
[tex] = - \frac{8}{(4x + 1)^{ \frac{3}{2} } } [/tex]