⑴ ____
⑵ ____
⑶ ____
⑷ ____
⑸ ____
All the students ____ ____ ____ at the party.
化简求值:已知α为第三象限角,且cosα-π2=-15,求sin2π-αcosπ+αtanπ-αtanπ+αsinπ-α的值.