2(
| ||||||
|
=
| 2sin40° | ||
|
=
| 2 |
計算：cos10°+3sin10°1?cos80°=_．
計算：
=______．
cos10°+
| ||
|
數(shù)學人氣：864 ℃時間：2020-06-19 22:48:33
優(yōu)質(zhì)解答
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