Answer
$$h'(x)=2x\cosh{(x^2)} $$
Work Step by Step
$h'(x)=\frac{d}{dx}\sinh {(x^2)}$
Using the chain rule:
$h'(x)=\frac{d\sinh {(x^2)}}{dx^2}
\times \frac{dx^2}{dx}$
$=\cosh {(x^2)} \times 2x$
$=2x\cosh{(x^2)} $
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