# Find the derivative of e^x / sqrt(2)

1. Nov 20, 2007

### surfhare75

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. Nov 20, 2007

### mrroboto

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)

3. Nov 20, 2007

### HallsofIvy

Staff Emeritus
You don't have a "quotient"! You just have ex multiplied by a CONSTANT.

4. Nov 21, 2007

### danni7070

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

5. Nov 21, 2007

### HallsofIvy

Staff Emeritus
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.