题目内容
已知tanx=2,则
的值为______.
| 3sin2x+2cos2x |
| cos2x-3sin2x |
∵tanx=2,
则
=
=
=
=-
则
| 3sin2x+2cos2x |
| cos2x-3sin2x |
| 6sinxcosx+2(cos2x-sin2x) |
| cos2x-sin2x-6sinxcosx |
=
| ||||
|
=
| ||||
|
=-
| 7 |
| 15 |
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