Calculus Help

[jediali]

Originally Posted by man 430gt

That just hurts...

if only my 5th engineeirng degree stuff was this inviting, this is the fun bit!

[Vaigra]

I think he mean he wants each step broken down.
I don't see how that will help you blingbling unless somebody explains it all you.

[man 430gt]

Originally Posted by Vaigra

I think he mean he wants each step broken down.
I don't see how that will help you blingbling unless somebody explains it all you.

Leave it man, I'm too bloody tired to try and commit my self to anything mathematical...

[jediali]

Originally Posted by jediali

hope this is clearer

if there is stuff you can't understand here, then you might need to look back on notes, we cant teach you all about differentiation, there is no quick solution. sorry to be a bummer if am, you are welcome to ask me/us individual questions like "how to derive an exponential function on its own".or tell us Where is it you struggle? best of luck

[Vaigra]

I remember doing all that and being very good at it. 2 years without maths of any sort and I REALLY need to refresh, thanks for the thread

[Zorlox]

hope this helps. finally having a tablet comes in handy. just in case you don't trust me, mathematica's answer is attached too.

[Alastor]

Originally Posted by Bob

looking at that, i might not have done the derivative of e^u correctly. but i think i did. one of us is wrong.

Your first derivative is the correct one.

However, is the second derivative correct? The first two components look right but the third doesn't (looking at the non-simplified form).

Should it be:

(2/x^2)e^(-1/x^2)(2/x^2)

or

(2/x^3)e^(-1/x^2)(2/x^2)

[baddabang]

Wow I am so glad I never have to take a Math course again. EvAr!!!!

[jediali]

maths is funnnn

[baddabang]

Originally Posted by jediali

maths is funnnn

Going to the strip club is fun. Math isn't.

[drakkie]

Originally Posted by baddabang

Going to the strip club is fun. Math isn't.

Math is fun when you calculate stuff on engine and valves and those kind of stuff Otherwise it is boring,difficult and annoying

[jediali]

Originally Posted by drakkie

Math is fun when you calculate stuff on engine and valves and those kind of stuff Otherwise it is boring,difficult and annoying

that is what makes an engineering course more fun and useful than a maths course

[Bob]

Originally Posted by Alastor

Your first derivative is the correct one.

However, is the second derivative correct? The first two components look right but the third doesn't (looking at the non-simplified form).

Should it be:

(2/x^2)e^(-1/x^2)(2/x^2)

or

(2/x^3)e^(-1/x^2)(2/x^2)

Yes i did this quickly it goes like you said and the final answer comes out
((-2/x^3)+(4/x^5))e^(-1/x^2)
which is correct its the same answer given by mathematica in someone else's post. In my hurry to be done i didn't check my exponenets.

[Bob]

Originally Posted by jediali

hope this is clearer

Your derivation of e^u is wrong.

d/dx e^u = u'e^(u)

you have it as

d/dx e^u = e^(u')

[MRR]

Originally Posted by jediali

that is what makes an engineering course more fun and useful than a maths course

Agreed and I hate it when math teachers say just do math for the sake of math (even though I do like it). It is supposed to be a tool and applications in the real world are most important.