题目内容
sin30°+sin45°-| 1 | 3 |
分析:分别把sin30°=
,sin45°=
,tan60°=
代入原式计算即可.
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解答:解:原式=
+
-
×(
)2=
+
-1
=
.
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=
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点评:本题比较简单,只要熟知特殊角度的三角函数值即可.
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