Complex number simplification. Confused how to solve. Please help

First leave one aside and take out i common from sinπ/8 +icosπ/8.. same do it in denominator. Then write cosπ/8-i sinπ/8 in e^i(-π/8).. do it similarly in denominator.. then multiply and divide by 1+ e^iπ/8 . And just simplify to get answer as -1.