
(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)-![]()