计算:(1)sin230°+cos245°+sin60°•tan45°(2)2sin45°+cos30°•tan60°-(-3)2.-数学

题目简介

计算:(1)sin230°+cos245°+sin60°•tan45°(2)2sin45°+cos30°•tan60°-(-3)2.-数学

题目详情

计算:
(1)sin230°+cos245°+sin60°•tan45°   
(2)
2
sin45°+cos30°•tan60°-
(-3)2
题型:解答题难度:中档来源:不详

答案

(1)原式=class="stub"1
4
+class="stub"1
2
+
3
2
×1
=class="stub"3
4
+
3
2


(2)原式=
2
×
2
2
+
3
2
×
3
-3
=-class="stub"1
2

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