Answer
$\frac{b^{10}c^4}{a^6}$
Work Step by Step
(a$^3$b$^{-5}$c$^{-2}$)$^{-2}$
=a$^{-6}$b$^{10}$c$^4$
$=\frac{b^{10}c^4}{a^6}$
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