问题
解答题
已知sin(x+
|
答案
∵sin(x+
)=π 6 1 4
∴sin(x-
)+ sin2(5π 6
-x)=sin[π-(x+π 3
)]+sin2[π 6
-( π 2
+x)]=sin(x+π 6
)+cos2(x+π 6
)=π 6
+1 4
=15 16 19 16
搜题请搜索小程序“爱下问搜题”
已知sin(x+
|
∵sin(x+
)=π 6 1 4
∴sin(x-
)+ sin2(5π 6
-x)=sin[π-(x+π 3
)]+sin2[π 6
-( π 2
+x)]=sin(x+π 6
)+cos2(x+π 6
)=π 6
+1 4
=15 16 19 16