Answer
$u=\csc{x}.$
$y=u^3.$
Work Step by Step
Working from the inside out:
Take $x$; find the cosecant of it$\leftarrow$ "inner function."
Take $\csc{x}$; cube it $\leftarrow$ "outer function."
$u=\csc{x}.$
$y=u^3.$
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