| π |
| 12 |
| 3 |
| π |
| 12 |
| 1 |
| 2 |
| π |
| 12 |
| ||
| 2 |
| π |
| 12 |
| π |
| 12 |
| π |
| 3 |
| π |
| 12 |
| π |
| 3 |
| π |
| 12 |
| π |
| 3 |
| π |
| 4 |
| ||
| 2 |
| 2 |
計(jì)算：sinπ12-3cosπ12．
計(jì)算：sin
-
cos
．
| π |
| 12 |
| 3 |
| π |
| 12 |
數(shù)學(xué)人氣：564 ℃時(shí)間：2020-07-29 14:25:25
優(yōu)質(zhì)解答
sin
-
cos
=2（
sin
-
cos
）=2（sin
cos
-cos
sin
）=2sin（
-
）=2sin（-
）=-2×
=-
．
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