计算:(1)tan30°+2sin60°?cos45°;(2)3tan245°-3(sin60°-2tan30°);(3)3tan30°?2tan60°s
计算:(1)tan30°+2sin60°?cos45°;(2)3tan245°-3(sin60°-2tan30°);(3)3tan30°?2tan60°sin60°+co...
计算:(1)tan30°+2sin60°?cos45°;(2)3tan245°-3(sin60°-2tan30°);(3)3tan30°?2tan60°sin60°+cos225°+sin225°.
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(1)原式=
+2×
×
=
+
;
(2)原式=3×1-
(
-2×
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(2)原式=3×1-
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