Given: sine (a) = startfraction 5 over 13 endfraction, startfraction pi over 2 endfraction < a < pi and tangent (b) = negative startroot 13 endroot, startfraction pi over 2 endfraction < b < pi what is tan(a â€" b)? startfraction 5 12 startroot 13 endroot over 12 minus 5 startroot 13 endroot endfraction startfraction 12 minus 5 startroot 13 endroot over 5 12 startroot 13 endroot endfraction startfraction 12 5 startroot 13 endroot over negative 5 12 startroot 13 endroot endfraction startfraction negative 5 12 startroot 13 endroot over 12 5 startroot 13 endroot endfraction