sin80°-sin20°
sin²20°+sin²80°-sin20°sin80°=?
sin20°sin40°sin60°sin80°的值为
sin10°+sin20°+sin40°+sin50°+sin70°+sin80°求步骤加答案各方学霸求解答谢谢啦!
在平面直角坐标系中,已知两点A(cos80°,sin80°)、B(cos20°,sin20°),则AB两点的距离为
求值:cos20°sin20°
1/sin10°-根号3/sin80°
1/sin10°-√3/sin80°
1/cos20°-根号3/sin20°
(sin10°+sin20°cos30°)/(cos10°-sin20°sin30°) 值
cos65°-sin80°sin15°/cos5°-co..
求值:sin10°sin50°sin70°sin80°
求值:(2sin80°-cos70°)/cos20°