求值:(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)怎么做? 过程!
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求值:(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)怎么做?过程!求值:(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)怎么做?过程!求值
求值:(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)怎么做? 过程!
求值:(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)
怎么做?
过程!
求值:(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)怎么做? 过程!
sin9+sin6cos15
=sin(15-6)+sin6cos15
=sin15cos6-sin6cos15+sin6cos15
=sin15cos6
cos9-sin6sin15
=cos(15-6)-sin6sin15
=cos15cos6+sin15sin6-sin6sin15
=cos15cos6
sin15cos6/cos15cos6
=tan15
sin9°=sin(15°-6°)=sin15°cos6°-cos15°sin6°
cos9°=cos(15°-6°)=cos15°cos6°+sin15°sin6°
(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)
=(sin15°cos6°)/(cos15°cos6°)
=tan15°
求值.(cos15°*sin9°+sin6°)/(sin15°*sin9°-cos6°)
求值:(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)怎么做? 过程!
cos15°sin9°+sin6°/sin15°sin9°—cos6°=
sin6°+cos15°sin9°/cos6°-sin15°sin9°
(cos15°sin9°+sin6°)/(sin15°sin9°-cos6°)=
计算:(sin9°+cos15°sin6°)÷(cos9°-sin15°sin6°)
计算三角函数(和角公式)sin9°+sin6°cos15°/cos9°-sin6°sin15°
求值(sin9°cos15°-sin24°)/(sin9°sin15°+cos24°)
sin6+cos15*sin9/cos6-sin15*sin9数字上面有度数
化简:(cos15度sin9度+sin6度)/(sin15度sin9度-cos6度)
(sin9+sin6*cos15)/(cos9+sin6*sin15)数字后面的单位为 度,即sin9指的是sin九度.
sin9°cos15°-sin24°/sin9°sin15°+cos24°的值为___
高一三角比问题 急~1 sin9°=sin6°cos15°分数线 cos9°-sin6°sin15°化简 过程已知sin(x-y)cosx-cos(x-y)sinx=m 且为第三象限角 则cosy?同理 过程sin(x-π分数线6)=三分之一 x属于 0,90° 则cosx=万分感谢
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化简:(cos15度sin9度+sin6度)/(sin15度sin9度-cos6度)原式=[cos15sin9+sin(15-9)]/[sin15sin9-cos(15-9)]=(cos15sin9+sin15cos9-cos15sin9)/(sin15sin9-cos15cos9-sin15sin9)=sin15cos9/(-cos15cos9)=sin15/cos15=-tan15=-tan(45-30)=-(tan45-tan30