题目内容
计算:
(1)
-tan45°
(2)sin30°-cos245°+cot260°+sin260°
(1)
| sin60°-cos45° |
| sin30° |
(2)sin30°-cos245°+cot260°+sin260°
(1)原式=
-1=
-
-1,
(2)原式=
-
+
+
=
.
| ||||||||
|
| 3 |
| 2 |
(2)原式=
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 3 |
| 4 |
| 13 |
| 12 |
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