1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Find the derivative of e^x / sqrt(2)

  1. Nov 20, 2007 #1
    I must be brain dead ,but I can not seem to compute the derivative of e^x/sqrt2

    I am stuck when I used the quotient rule for derivatives
  2. jcsd
  3. Nov 20, 2007 #2
    if you're problem is deriv of (e^x)/sqrt2 then try factoring out the sqrt2. If not the quotient rule is (F'G - FG')/(G^2)
  4. Nov 20, 2007 #3


    User Avatar
    Science Advisor

    You don't have a "quotient"! You just have ex multiplied by a CONSTANT.
  5. Nov 21, 2007 #4
    d/dx e^x = e^x

    d/dx sqrt(2) = 0

    I don't know the english name for this rule but call e^x = u and sqrt(2) = v

    d/dx u/v = (u'v-uv')/v^2
  6. Nov 21, 2007 #5


    User Avatar
    Science Advisor

    That would be the "quotient rule" referred to before. However, you don't really need either the product rule or quotient rule when the other "function" is a constant!
    If C is a constant, then (Cf(x))'= Cf '(x) and (f(x)/C)'= f'(x)/C. Most people learn those long before (well, maybe a week) before they learn the product rule or quotient rule.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook