Derivative of an Inverse Function
Let the function $f$ be defined by $f(x) = \sec(x)$. What is the value of $[f^{-1}]'(2)$?
A
Undefined
B
$\frac{1}{2}$
C
$\frac{2}{\sqrt{3}}$
D
$\frac{\sqrt{3}}{2}$
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