问题
解答题
计算: (1)
(2)sin30°-cos245°+cot260°+sin260° |
答案
(1)原式=
-1=
- 3 2 2 2 1 2
- 3
-1,2
(2)原式=
- 1 2
+1 2
+1 3
=3 4
.13 12
计算: (1)
(2)sin30°-cos245°+cot260°+sin260° |
(1)原式=
-1=
- 3 2 2 2 1 2
- 3
-1,2
(2)原式=
- 1 2
+1 2
+1 3
=3 4
.13 12