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Basically, I've been doing calculus and the bit I'm struggling with is the simplifications. It seems like because I've had to start learning from scratch again I've had to move over things so quickly that some of the basics haven't sunk in.

For example, differentiating f(x) = √x / ln(4x)

I had no problem coming up with this

__(ln(4x))(1/2√x) - (√x)(1/x)__

(ln4x)

^{2}

But I didn't even know where to start with simplifying it. I have the answer now, and even looking at the answer I still can't do it myself. Can anyone recommend any material I could work through to help with things like this? I've looked at Khan academy but this seems to be too much of a general thing to be covered.

Thanks.