sin75°+cos75°sin75°?cos75°=______
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∵tan75°=tan（45°+30°）=
=
=
=
=2+
，
∴
=
=
| tan45°+tan30° |
| 1?tan45°tan30° |
1+
| ||||
1?
|
3+
| ||
3?
|
12+6
| ||
| 6 |
| 3 |
∴
| sin75°+cos75° |
| sin75°?cos75° |
| tan75°+1 |
| tan75°?1 |
2+
|
