The function f and g are differentiable at x=10 and x=20 and f(g(x))=x^2. if f(10)=5, f'(10)=4, f'(20)=-5, and g(10)=20, what is the value of g'(10)?

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have you used chain rule to differentiate f(g(x)) yet?

I learned how to do the chain rule

ok then what is \[\frac{d}{dx}f(g(x))=?\]

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