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# Help with differentiation watch

1. Hi there,
Could someone with a bit of skill help me differentiate this:

with respect to RHmeas?

It's been so long since I did anything like this!

RHTarget is a constant, RHmeas is a variable, Gmeas is a variable, Gcorr will also be a variable.
2. It would probably help visually if you replaced some of the variable names by single letters.

Let , then you have

Where I imagine you're holding a,b constant, so now you're trying to find . Now it's fairly straightforward. Setting we get , and since you can find fairly easily... then you multiply them together.
3. Hello nuodai,

You're certainly right about swapping variable names for letters!

If I have , everything does indeed become simpler.

Thank you so much for your reply, I am working through it now.

EDIT: I'll have to use chain rule

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