题目内容
计算:
| ||
| 2 |
| 2 |
| ||
| 3 |
分析:根据特殊角的三角函数值先进行化简,然后根据实数运算法则进行计算得出答案.
解答:解:原式=
×
-
×
-
×
×
=
-1-
=-
.
| ||
| 2 |
| ||
| 2 |
| 2 |
| ||
| 2 |
| ||
| 3 |
| ||
| 3 |
| 1 |
| 2 |
=
| 3 |
| 4 |
| 1 |
| 6 |
=-
| 5 |
| 12 |
点评:本题主要考查了特殊角的三角函数值及实数运算法则,比较简单.
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题目内容
计算:
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| 2 |
| 2 |
| ||
| 3 |
| ||
| 2 |
| ||
| 2 |
| 2 |
| ||
| 2 |
| ||
| 3 |
| ||
| 3 |
| 1 |
| 2 |
| 3 |
| 4 |
| 1 |
| 6 |
| 5 |
| 12 |