题目内容
化简：
•
•
| sin(540°-x) |
| tan(900°-x) |
| 1 |
| tan(450°-x)tan(810°-x) |
| cos(360°-x) |
| sin(-x) |
原式=
| sin(180°-x) |
| tan(-x) |
| 1 |
| tan(90°-x)tan(90°-x) |
| cosx |
| sin(-x) |
=
| sinx |
| -tanx |
| 1 |
| cot2x |
| 1 |
| -tanx |
=sinx
故答案为：sinx
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