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∵sin60°=
,tan30°=
,
∴原式=2×
-
=
-
=
.
故答案为:
| ||
2 |
| ||
3 |
∴原式=2×
| ||
2 |
| ||
3 |
=
3 |
| ||
3 |
=
2
| ||
3 |
故答案为:
2
|