求sin39°-sin21°/cos39°-cos21°的值急需过程,谢谢!
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![求sin39°-sin21°/cos39°-cos21°的值急需过程,谢谢!](/uploads/image/z/1596370-58-0.jpg?t=%E6%B1%82sin39%C2%B0-sin21%C2%B0%2Fcos39%C2%B0-cos21%C2%B0%E7%9A%84%E5%80%BC%E6%80%A5%E9%9C%80%E8%BF%87%E7%A8%8B%2C%E8%B0%A2%E8%B0%A2%21)
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求sin39°-sin21°/cos39°-cos21°的值急需过程,谢谢!
求sin39°-sin21°/cos39°-cos21°的值
急需过程,谢谢!
求sin39°-sin21°/cos39°-cos21°的值急需过程,谢谢!
用积化和差公式.
2cos30*sin9/-2sin30*sin9=-cos30/sin30=-根号3
(sin39° -sin21°)/(cos39°-cos21°)
sin21°cos39°+cos21°sin39°=
求sin39°-sin21°/cos39°-cos21°的值急需过程,谢谢!
(sin24°cos6°-sin66°sin6°)/(sin21°cos39°-cos21°sin39°)
(sin24°cos6°-sin66°sin6°)/(sin21°cos39°-cos21°sin39°)化简后得
cos39°cos9°+sin39°sin9°=
sin39°-sin30°cos9°/cos39°-cos30°cos9°
求sin21°+sin22°+...+sin289°的值.
cos51°cos9°-cos39°sin9°=
sin21°cos24°+cos21°sin24°
sin21°cos81°-cos21°sin81°=?
求值sin21°cos24°+cos21°sin24°过程
sin21°cos81°-sin69°cos9°
求值sin21°cos24°+cos21°sin24°过程
求值:sin21°cos81°-sin69°cos9°
sin21°cos81°+cos189°sin69°化简
sin21°cos9°+cos21°sin9°=?
求值:sin21/4π tan(-23/6π) cos1500°