sin9°cos15°-sin24°/sin9°sin15°+cos24°的值为___
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sin9°cos15°-sin24°/sin9°sin15°+cos24°的值为___
![sin9°cos15°-sin24°/sin9°sin15°+cos24°的值为___](/uploads/image/z/18921483-27-3.jpg?t=sin9%C2%B0cos15%C2%B0-sin24%C2%B0%2Fsin9%C2%B0sin15%C2%B0%2Bcos24%C2%B0%E7%9A%84%E5%80%BC%E4%B8%BA___)
sin9°cos15°-sin24°/sin9°sin15°+cos24°
=sin9°cos15°-sin(9°+15°)/sin9°sin15°+cos(9°+15°)
=sin9°cos15°-sin9°cos15°-cos9°sin15°/sin9°sin15°+cos9°cos15°-sin9°sin15°
=-cos9°sin15°/cos9°cos15°
=-tan15°
≈-0.268
=sin9°cos15°-sin(9°+15°)/sin9°sin15°+cos(9°+15°)
=sin9°cos15°-sin9°cos15°-cos9°sin15°/sin9°sin15°+cos9°cos15°-sin9°sin15°
=-cos9°sin15°/cos9°cos15°
=-tan15°
≈-0.268
求值(sin9°cos15°-sin24°)/(sin9°sin15°+cos24°)
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