问题
解答题
计算: (1) 2sin230°•tan30°+cos60°•tan60°; (2) sin245°-tan230°+
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答案
(1)原式=
• 1 2
+3 3
• 1 2
=3
,2 3 3
(2)原式=
-1 2
+1 3
=13 2
-15 2
.1 6
计算: (1) 2sin230°•tan30°+cos60°•tan60°; (2) sin245°-tan230°+
|
(1)原式=
• 1 2
+3 3
• 1 2
=3
,2 3 3
(2)原式=
-1 2
+1 3
=13 2
-15 2
.1 6