题目内容
计算:(1)2sin30°+cot60°-
tan260° |
cot230° |
(2)|tan45°-tan60°|+
sin260°-2cos30°+1 |
分析:分别把各角的三角函数值代入进行计算即可.
解答:解:(1)原式=1+
-1+1
=1+
=
;
(2)原式=
-1+
=
-1+|
-1|
=
-1+1-
=
.
| ||
3 |
=1+
| ||
3 |
=
3+
| ||
3 |
(2)原式=
3 |
(sin60°-1)2 |
=
3 |
| ||
2 |
=
3 |
| ||
2 |
=
| ||
2 |
点评:本题比较简单,只要熟记特殊角的三角函数值即可.
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