题目
y=sin2x+2sinxcosx的周期是______.
提问时间:2021-04-01
答案
∵y=sin2x+2sinxcosx
=
+sin2x
=sin2x-
cos2x+
=
=
1−cos2x |
2 |
=sin2x-
1 |
2 |
1 |
2 |
=
|