cos10°+cos110°-cos50°=
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cos10°+cos110°-cos50°=
cos10°+cos110°-cos50°=
cos10°+cos110°-cos50°=
cos10°+cos110°-cos50°
=2cos60°cos50°-cos50°
=cos50°-cos50°
=0
cos10°+cos110°-cos50°=
cos10°+cos110 °+cos130
求值:cos10°/cos50°
cos10°cos110°-cos200°cos100°?
(sin10°+cos50°)/(cos10°-sin50°)?
sin10°cos50°+sin50°cos10°
sin10°cos50°+sin50°cos10°
cos80°*cos50°+cos10°*cos40°=
求值 (cos10°+根号3sin10°)/cos50°
求(sin40°+cos10°)/cos20° =(cos50°+cos10°)/cos20°
cos60°cos10°/cos50°=cos10°sin50°/2sin50°cos50° 这一步怎么出来啊
(cos10°-cos50°)÷(sin10°-sin50°)
sin10°cos50°+sin50°cos10°的三角函数值
(sin50°*cos50°)/(cos60°*cos10°)怎样化简
求值:cos10°cos40°+cos80°cos50°请写出详细过程
cos80°cos50°+sin50°cos10°怎么做的 二分之根号三
和角公式 sin50°cos10°+cos50°sin10°
(cos10°)平方+(cos50°)平方+(cos20°)平方