题目内容
计算:(1)cos245°+sin60°•tan30°-tan30°
(2)
(2)
| sin60°+tan45° |
| cos30°-2sin30° |
(1)原式=
+
-
=1-
,
(2)原式=
=-7-4
.
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(2)原式=
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题目内容
| sin60°+tan45° |
| cos30°-2sin30° |
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