cos(π/3)cos(π/4)cos(π/5)……=1/2[cos(π/3+π/4)cos(π/5)+cos(π/3-π/4)cos(π/5)]cos(π/6)cos(π/7)cos(π/8)……再次使用乘积公式，我们有：cos(π/3)cos(π/4)cos(π/5)……=1/4[cos(π/7)+cos(π/6)][cos(π/8)+cos(π/5)][
由:\cos x = \prod_{k\geq 0}\left(1-\frac{4x^2}{\pi^2(2k+1)^2}\right) \tag{1}...
Adipic acid bis(4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13,14,14,15,15,16,16,17,17,18,18,19,19,20,20,21,21,22,22,23,23,24,24,25,25,25-pentatetracontafluoro-2-hydroxypentacosyl) ester推荐供应商 建议您优先选择企业会员,我们对企业会员产品有严格审核。
按国家浏览2,4,4,5,7,7,8,10,10,11,13,13,14,16,16,17,19,19,20,22,22,23,25,25,26,26,27,27,27-Nonacosafluoro-2,5,8,11,14,17,20,23-octakis(trifluoromethyl)-3,6,9,12,15,18,21,24-octaoxaheptacosanoic acid fluoride国外供应商中国供应商 ...
LanCos UVB-4 Basic informationMore.. Product Name:LanCos UVB-4 Synonyms:LanCos UVB-4 CAS: MF: MW:0 EINECS: Mol File:Mol File Information Error Report Your Email: Browse by NationalityLanCos UVB-4SuppliersChina suppliers United States(1)Member(1)All(1) ...
肯定收敛的。因为它的部分积序列单调递减，且有下界0。极限是几我还不知道咋算。
Product Name: Bis[4-(didocosylamino)butyric acid]calcium salt Synonyms: Bis[4-(didocosylamino)butyric acid]calcium salt CAS: MF: C96H192CaN2O4 MW: 1478.64068 EINECS: Mol File: Mol FileInformation Error Report Your Email: Browse by Nationality Bis[4-(didocosylamino)butyric acid]calcium sa...
英文名称: 4,6,10,12,16,18,22,24-Octamethylpentacyclo[19.3.1.13,7.19,13.115,19]octacosane-25,26,27,28-tetraol 英文同义词: 4,6,10,12,16,18,22,24-Octamethylpentacyclo[19.3.1.13,7.19,13.115,19]octacosane-25,26,27,28-tetraol CAS号: 分子式: 分子量: 0 EINECS号: 信息...
Chemical site Hot Keywords:18162-48-6,872-50-4,Methylene Chloride,naphthalene,THF,Titanium Dioxide 52088-89-8 Basic informationMore.. Product Name:(E,E)-(7-oleoyl-4-oxido-10-oxo-3,5,9-trioxa-4-phosphaheptacos-18-enyl)trimethylammonium 4-oxide ...
MF:C22H40D4O2 MW:344.61 EINECS: Mol File:Mol File Information Error Report Your Email: Browse by NationalityDOCOSANOIC-ACID, 3,3,5,5-D4SuppliersChina suppliers United Kingdom(2)United States(1)All(3) DOCOSANOIC-ACID, 3,3,5,5-D4RecommendSuppliers ...