题目内容
已知sin(-α-π)=
,则sin(9π+α)=________________.
解析:sin(-α-π)=-sin(π+α)=sinα=,
∴sin(9π+α)=sin(π+α)=-sinα=-
.
答案:-
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,则sin(9π+α)=________________.题目内容
已知sin(-α-π)=,则sin(9π+α)=________________.
解析:sin(-α-π)=-sin(π+α)=sinα=,
∴sin(9π+α)=sin(π+α)=-sinα=-.
答案:-