Sin124+sin4/-cos 124-cos 4=

sin124 + sin4/-(cos124 - cos4)
= 2sin½(128)*cos½(120) / -1(-2sin½(128)*sin½(120)
= 2sin64*cos60 / 2sin64*sin60
= cos60/sin60
= ½/½√3
= 1/√3 * √3/√3
= ⅓√3

semoga membantu :)