化简(sin15°cos9°-cos66°)/(sin15°sin9°+sin66°)的结果是?
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/13 19:24:13
化简(sin15°cos9°-cos66°)/(sin15°sin9°+sin66°)的结果是?
如上.
如上.
cos66=sin24
sin24=sin15*cos9+sin9*cos15
sin15*cos9-cos66=-sin9*cos15
sin66=cos24
cos24=cos15*cos9-sin15*sin9
sin15*sin9+sin66=cos15*cos9
则(sin15*cos9-cos66)/(sin15*sin9+sn66)
=-sin9cos15/(cos15cos9)
=-tan9
新春快乐!
sin24=sin15*cos9+sin9*cos15
sin15*cos9-cos66=-sin9*cos15
sin66=cos24
cos24=cos15*cos9-sin15*sin9
sin15*sin9+sin66=cos15*cos9
则(sin15*cos9-cos66)/(sin15*sin9+sn66)
=-sin9cos15/(cos15cos9)
=-tan9
新春快乐!
化简(sin15°cos9°-cos66°)/(sin15°sin9°+sin66°)的结果是?
(Sin15Cos9°—Cos66°)/(Sin15°Sin9°+Sin66°)可以化简为?要过程
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sin15°
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cos15°sin9°+sin6°/sin15°sin9°—cos6°=
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sin15°乘sin75°
sin15°sin75°=?
sin15°+cos165°=
sin15°+sin75°=?
sin15°cos165°的值是( )