化简:(sin40°+sin80°)/cos20°
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/03 15:47:07
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化简:(sin40°+sin80°)/cos20°
化简:(sin40°+sin80°)/cos20°
化简:(sin40°+sin80°)/cos20°
(sin40°+sin80°)/cos20°=2sin[(40°+80°)/2]*cos[(40°-80°)/2]/cos20°=√3
和差化积
sinθ+sinφ = 2 sin[(θ+φ)/2] cos[(θ-φ)/2]
sin40+sin80=2sin[(40+80)/2]*cos[(40-80)/2]=2sin60cos(-20)=2sin60cos20
其中cos(-θ)=cosθ
(sin40°+sin80°)/cos20°=2sin[(40°+80°)/2]*cos[(40°-80°)/2]/cos20°=√3
化简:(sin40°+sin80°)/cos20°
化简cos100°cos40°+sin80°sin40°
sin40°cos40°=sin80°?
2*sin80°*sin40怎么会等于2sin40°?
cos100°cos40°+sin80°sin40°
sin10°乘以sin40°+sin50°乘以sin80°
求sin20°+sin80°*sin40°的值.如上.
sin20°+sin40°-sin80°的值为
2cos40°sin40° 为啥等于sin80°呢?
化简求值:2cosˆ210°-tan5°(1+cos10°)-2sin40°sin80°
sin20°+sin40°-sin40°的值是多少对不起,打错了,是sin20°+sin40°-sin80°麻烦一下了
为何2cos40°sin40°/cos10°=sin80°/cos10°
求sin^2 40°+cos^2 10°-sin40°sin80°的值.
sin20°sin40°sin60°sin80°的值为答案为3/16
Sin20°*sin40°*sin60°*sin80°的乘积和完整步骤
cos40°cos80°+sin40°sin80°怎么算求详细过程
cos40°sin80°+sin40°cos80°等于多少请写清步骤哦~
化简求值:sin20° + sin40° - sin80°如何求值?公示和步骤写清楚