Answer
$f'(t)= \frac{2t}{\sqrt{1-t^4}}$
Work Step by Step
$f(t)=\arcsin(t^2)$
$let u=t^2, u'=2t$
$\frac{d}{dx}(\arcsin u)= \frac{u'}{\sqrt{1-u^2}}$
$f'(t)= \frac{2t}{\sqrt{1-t^4}}$
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