题目内容
化简
的值等于______．
| 1+tan150 |
| 1-tan150 |
∵
=
=
=
=
=
=
．
故答案为：
．
| 1+tan150 |
| 1-tan150 |
=
1+
| ||
1-
|
=
| sin15°+cos15° |
| cos15°-sin15° |
=
| (sin15°+cos15°)2 |
| (cos15°-sin15°)(cos15°+sin15°) |
=
| 1+sin30° |
| cos30° |
=
| ||||
|
| 3 |
故答案为：
| 3 |
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