3 |
sin50°(cos10°+
| ||
cos10° |
sin50°?2(sin10°cos30°+cos10°sin30°) |
cos10° |
sin50°?2sin40° |
cos10° |
2sin50°cos50° |
cos10° |
sin100° |
cos10° |
cos10° |
cos10° |
故選D
3 |
3 |
2 |
3 |
sin50°(cos10°+
| ||
cos10° |
sin50°?2(sin10°cos30°+cos10°sin30°) |
cos10° |
sin50°?2sin40° |
cos10° |
2sin50°cos50° |
cos10° |
sin100° |
cos10° |
cos10° |
cos10° |