The function to be differentiated is $y = \tan^{-1}(\cosh(x^2))$. This is a composite function, so we will need to use the chain rule.
The chain rule states that if $y = f(g(x))$, then $\frac{dy}{dx} = f'(g(x)) \cdot g'(x)$.
In our case, we have multiple layers
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