题目内容
cos2α=
,α∈(π,
),则tan(α+
)=______.
| 7 |
| 25 |
| 3π |
| 2 |
| π |
| 4 |
∵α∈(π,
),cos2α=
=2cos2α-1,可得 cosα=-
,∴
sinα=-
,tanα=
.
∴tan(α+
)=
=
,
故答案为
.
| 3π |
| 2 |
| 7 |
| 25 |
| 4 |
| 5 |
sinα=-
| 3 |
| 5 |
| 4 |
| 3 |
∴tan(α+
| π |
| 4 |
| tanα-1 |
| 1+tanα |
| 1 |
| 7 |
故答案为
| 1 |
| 7 |
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