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Your question seems a bit incomplete, but for starters you can write
Expanding where necessary, recalling that
, you have
and you can stop there, or continue to rewrite in terms of the reciprocal functions,
Now, since
, the final form could also take
or
Expanding where necessary, recalling that
and you can stop there, or continue to rewrite in terms of the reciprocal functions,
Now, since
or