Let $H(x) = h(h(x)h(x^2))$ be.
Is it something like this $h'(h(x)h(x^2))(h(x)h(x^2))'?$
what is a derivative of this function?
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$\color{red}{(h(x)h(x^2))'h'(h(x)h(x^2))}=(h'(x)h(x^2)+2xh'(x^2)h(x))h'(h(x)h(x^2))$ – R.N Nov 01 '15 at 21:19
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thank you! it means that you also used product rule, right? – tony Nov 01 '15 at 22:15
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yes, you are right – R.N Nov 01 '15 at 22:24