问题
填空题
cos(-
|
答案
cos(-
)-sin(-17π 4
)=cos17π 4
π+sin17 4 17π 4
=cos(4π+
)+sin(4π+π 4
)=cosπ 4
+sinπ 4 π 4
=
+2 2
=2 2
.2
故答案为:2
cos(-
|
cos(-
)-sin(-17π 4
)=cos17π 4
π+sin17 4 17π 4
=cos(4π+
)+sin(4π+π 4
)=cosπ 4
+sinπ 4 π 4
=
+2 2
=2 2
.2
故答案为:2