cos140°+2sin130°sin10°
答案:4 悬赏:10
解决时间 2021-11-16 23:24
- 提问者网友:浪荡羁士
- 2021-11-15 23:06
cos140°+2sin130°sin10°
最佳答案
- 二级知识专家网友:而你却相形见绌
- 2021-11-15 23:55
解:
cos140°+2sin130°sin10°
=cos(130°+10°)+2sin130°sin10°
=cos130°cos10°-sin130°sin10°+2sin130°sin10°
=cos130°cos10°+sin130°sin10°
=cos(130°-10°)
=cos120°
=-cos60°
=-0.5
cos140°+2sin130°sin10°
=cos(130°+10°)+2sin130°sin10°
=cos130°cos10°-sin130°sin10°+2sin130°sin10°
=cos130°cos10°+sin130°sin10°
=cos(130°-10°)
=cos120°
=-cos60°
=-0.5
全部回答
- 1楼网友:萝莉姐姐鹿小北
- 2021-11-16 04:12
cos140°+ 2sin130°sin10°≈0.98+2×0.93×0.54≈1.9844
- 2楼网友:余生继续浪
- 2021-11-16 02:41
cos(10°)*cos(140°)-sin(10°)*sin(140°) = -0.86602540378444
- 3楼网友:何以畏孤独
- 2021-11-16 01:12
cos(140°)+2*sin(130°)*sin(10°) = -0.5
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