I don't know how to show this:

If

Then

Can anyone help? Thanks.

Obviously you are just differnetiating first using the rule for differentiating arcsin but then once I evaluate it all I do not get the required solution.

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- May 20th 2009, 12:49 PMbobbyDifferentiating a function of hyperbolic functions
I don't know how to show this:

If

Then

Can anyone help? Thanks.

Obviously you are just differnetiating first using the rule for differentiating arcsin but then once I evaluate it all I do not get the required solution.

- May 20th 2009, 01:32 PMHallsofIvy
- May 20th 2009, 02:37 PMbobby
I'm reading it from a past paper and it does have the '2' in front of the strangely. Either way, i'm not sure on a couple of parts of your method.

Firstly,

In the 1st line of the differentiation, the 3rd term, I am unsure of why there is an in the square root, should this not be over 16?

Secondly,

I do not understand how you went from the first line to

is obvious but the other part is not so clear.