# Math Help - derivatives

1. ## derivatives

find the derivative.

#1.)

f(x) = (3x+1)^3/(x)^6

#2.)

f(x) = 1/2x+sin^3x

..if someone could help me out Fast! id really appreciate it. thanks

2. Here is the first one, using the quotient rule

$
y' = \frac{vu' - uv'}{v^2}
$

where
$
y = \frac{u}{v}
$

3. Originally Posted by ineedhelp123
find the derivative.

#2.)

f(x) = 1/2x+sin^3x

..if someone could help me out Fast! id really appreciate it. thanks
I am assuming you meant this

$
y = \frac{1}{2x+sin^3 x}
$

hope that helps

jacs

ps. sorry about crappy handwriting hope you can read, not confident enough in laTex yet

4. ## thanks!

Originally Posted by jacs
I am assuming you meant this

$
y = \frac{1}{2x+sin^3 x}
$

hope that helps

jacs

ps. sorry about crappy handwriting hope you can read, not confident enough in laTex yet
thanks sooo much for all your help! it all makes sense now. i really appreciate it. thanks!

5. you are welcome