题目内容
化简：sin
•cos
•tan
=______．
| 4π |
| 3 |
| 19π |
| 6 |
| 21π |
| 4 |
原式=sin(π+
)•cos(3π+
)tan(5π+
)
=-sin
•（-cos
）•tan
=
•
×1
=
．
| π |
| 3 |
| π |
| 6 |
| π |
| 4 |
=-sin
| π |
| 3 |
| π |
| 6 |
| π |
| 4 |
=
| ||
| 2 |
| ||
| 2 |
=
| 3 |
| 4 |
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题目内容
| 4π |
| 3 |
| 19π |
| 6 |
| 21π |
| 4 |
| π |
| 3 |
| π |
| 6 |
| π |
| 4 |
| π |
| 3 |
| π |
| 6 |
| π |
| 4 |
| ||
| 2 |
| ||
| 2 |
| 3 |
| 4 |