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"ARGH Mathe Help please"

Differentiation!

Argh... I know what to do, but now I'm stuck with differentiating this;


16(pi)h^3
81

(see what i did there with underlining and fractions? :-P)

I'm stuck. Quite bad.

Help! :-)

This confirms why I'm not doing Alevel Maths.

aha, I see..

Thank ye so much, you've rescued me from the evil clutches of my Pure teacher... :-)

Wait a second - I got it wrong. Here's the right answer, and I'll go through the 81 bit.

Right, so, something divided by 81 is the same as something multiplied by 1 over 81. So in my head I did the differentiation of:

(1/81)(16)(pi)(h^3)

Which is equivalent to:

(16/81)(pi)(h^3)

Which, differentiated in terms of h, becomes:

3(16/81)(pi)(h^2) = (48/81)(pi)(h^2)

yes, that is differenciation according to what I've been told... but it's the 'divide by 81' bit that confuses me...

You know, the golden rule for differentiation:

x^n differentiates to nx^n-1

Spank ye very much,

but how did you do that? :-)

(for future referance)

(32/18)(pi)(h^2)

Edit:

Whoops, this is wrong.

It's actually (48/81)(pi)(h^2).

Differentiation!

Argh... I know what to do, but now I'm stuck with differentiating this;


16(pi)h^3
81

(see what i did there with underlining and fractions? :-P)

I'm stuck. Quite bad.

Help! :-)