题目内容
在△ABC中,若角B=60°,则tan
+tan
+
tan
tan
=______.
| A |
| 2 |
| C |
| 2 |
| 3 |
| A |
| 2 |
| C |
| 2 |
∵tan
=
,∠B=60°,
∴tan
+tan
=tan
(1-tan
tan
)=tan60°(1-tan
tan
)=
(1-tan
tan
),
则tan
+tan
+
tan
tan
=
(1-tan
tan
)+
tan
tan
=
.
故答案为:
| A+C |
| 2 |
tan
| ||||
1-tan
|
∴tan
| A |
| 2 |
| C |
| 2 |
| A+C |
| 2 |
| A |
| 2 |
| C |
| 2 |
| A |
| 2 |
| C |
| 2 |
| 3 |
| A |
| 2 |
| C |
| 2 |
则tan
| A |
| 2 |
| C |
| 2 |
| 3 |
| A |
| 2 |
| C |
| 2 |
| 3 |
| A |
| 2 |
| C |
| 2 |
| 3 |
| A |
| 2 |
| C |
| 2 |
| 3 |
故答案为:
| 3 |
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