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sin300° cos315° 2sin3/2℃兀
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cos135°等于多少啊在线求答案
![cos0615°? cos21°](https://img.wumaow.org/upload/tu/426242880.jpg)
cos0615°?
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809, 求cos21π/5等于多少
图片内容是:cos21°
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36 2013-05-21 cos30°cos45° sin30°sin45°等于多少?
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高一数学cos二分之21π等于多少
![sin13°cos17°-cos13sin17=1/2 sin140°cos20 sin50sin cos21°](https://img.wumaow.org/upload/tu/426242884.jpg)
sin13°cos17°-cos13sin17=1/2 sin140°cos20 sin50sin
![(cos15°-cos75°)(sin75° sin15°)=?详细过程,谢谢! cos21°](https://img.wumaow.org/upload/tu/426242885.jpg)
(cos15°-cos75°)(sin75° sin15°)=?详细过程,谢谢!
![sin21°cos81°-sin69°cos9°= cos21°](https://img.wumaow.org/upload/tu/426242886.jpg)
sin21°cos81°-sin69°cos9°=