(sin20°+cos30°sin10°)/(cos20°-sin30°sin10°)
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/20 00:37:31
(sin20°+cos30°sin10°)/(cos20°-sin30°sin10°)
![(sin20°+cos30°sin10°)/(cos20°-sin30°sin10°)](/uploads/image/z/15927787-19-7.jpg?t=%28sin20%C2%B0%2Bcos30%C2%B0sin10%C2%B0%29%2F%28cos20%C2%B0-sin30%C2%B0sin10%C2%B0%29)
原式=[sin(30°-10°)+cos30°sin10°]/[cos(30°-10°)-sin30°sin10°]
=(sin30°cos10°)/(cos30°cos10°)
=sin30°/cos30°
=(√3)/3
=(sin30°cos10°)/(cos30°cos10°)
=sin30°/cos30°
=(√3)/3
(sin10°+sin20°cos30°)/(cos10°-sin20°sin30°) 值
cos20°cos10°+sin10°sin10°
sin40°*(1-sin10°)/[sin10°*(cos20°)^2]
化简((cos20°/sin20°)cos10°)+根号3(sin10°tan70°)-2cos40°
(sin10°+sin20°)/(cos10°+cos20°)化简求值
sin10°+sin20°+sin30°+sin40°+sin50°+……+sin2000°=?
计算:sin10°cos20°sin30°cos40°=______.
求(sin30°/sin10°)-(cos30°/cos10°)的值
sin20°×cos7o°+sin10°×sin50°的值
sin20°cos70°+sin10°sin50°
sin20°cos70°+sin10°sin50°等于
(cos10°-根号3sin10°)/sin20°