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Using theorems to determine derivative

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Using the fundamental theorem of calculus and chain rule,
For example, letting the expression equal F(x), and G(u)
So for 1) we would have F(x)=G(x )
By the chain rule,
dF/dx(x)=(dG/du)|u= x (du/dx)
=(1/ | u=x ) (2x)
=2x//
Determine the derivative:

1)
d/dx

2)
d/dx

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