| 3 |
| cos10° |
| sin50° |
=
(sin100?
| ||
| cos100?sin500 |
=
2(
| ||||||
| sin500 |
=
| 2(sin100cos600?cos100sin600) |
| sin500 |
=
| 2sin(?500) |
| sin500 |
化簡：(tan10°?3)?cos10°sin50°．
化簡：(tan10°?
)?
．
| 3 |
| cos10° |
| sin50° |
數(shù)學(xué)人氣：864 ℃時間：2020-06-15 18:20:33
優(yōu)質(zhì)解答
(tan10°?
)?
=
=
=
=
=-2
=
=
=
=
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