Answer
$9^o43'$
Work Step by Step
RECALL:
$1^o=60'$
Thus.
$25^o15' - 15^o32'
\\= 24^o(1^o+15') - 15^o32'
\\=24^o(60+15)' - 15^o32'
\\=24^o75' - 15^o32'$
Subtract the corresponding parts to obtain:
$=(24-15)^o (75-32)'
\\=9^o43'$