(1)在图(a)中,390°角的正弦值是________,P点坐标为________;
(2)在图(b)中,-30°角的正弦值是________,P点坐标是________;
(3)sin(+
)=________;
(4)sin(π+)=________.
(1)在图(a)中,390°角的正弦值是________,P点坐标为________;
(2)在图(b)中,-30°角的正弦值是________,P点坐标是________;
(3)sin(+
)=________;
(4)sin(π+)=________.
(1) (
,
) (2)-
(
,-
) (3)
(4)-