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THat's what the question says... =s

Thanks guys. Yeh, i know all the rules, just that apparently the (m^2+4b)^1/2 is a constant because it doesn't have an x in it and therefore is 0 when you differentiate it =s Just don't get that part.

Differentiate 1/2(mx-x^2+b)(m^2+4b)^1/2 in terms of m I can't get my head around it my answer doesn't match the teacher's answer =s Thanks guys