题目内容
2cos40°(1+
tan10°)=______.
| 3 |
2cos40°(1+
tan10°)
=2cos40°(1+
•
)
=2
(cos10°+
sin10°)
=2
•2sin40°
=2
=2.
故答案为:2.
| 3 |
=2cos40°(1+
| 3 |
| sin10° |
| cos10° |
=2
| cos40° |
| cos10° |
| 3 |
=2
| cos40° |
| cos10° |
=2
| sin80° |
| cos10° |
=2.
故答案为:2.
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