In a triangle ABC, the value of sinA+sinB+sinC is 03:59 If A+B+C = 180^@ then (sin 2A + sin 2B + sin 2C) / (cosA + cosB + cosC... 09:54 If alpha+beta+gamma=2pi then 01:54 In a DeltaABC sum((cotA+cotB)/(tanA+tanB)) is equal to 02:54Exams...
112. If in a ΔABC,cosA+cosB+cosc=32. Prove that ΔABC is an equilateral triangle. View Solution In a ΔABC, 2 sinA cos B + 2 sin B cos C + 2 sin cos A = sin A + sin B + sin C, then ΔABCis View Solution In a triangle ABC, a (b cos C - c cos B) = View ...
百度试题 结果1 题目证明(sinA-sinB)/(cosB-cosA)-cos(A+B)/2 .in A -ain B cus B -cus.4 相关知识点: 试题来源: 解析 解 原式左边 A+B A -B A +B B A -B 反馈 收藏
16.在△ABC中,求证: sinA+sinB+sinC=4cosA/2cosB/2cosC/2 .16.在△ABC中,求证: A B in A + sin
The results of the Shubnikov–de Haas oscillations measurements on CoSb3 single crystals are presented for the first time. The measurements were performed in the temperature range 1.8–10 K in pulsed high magnetic fields up to 40 T. The values of cyclotron effective mass, and the g-...
Filling fraction limits (FFLs) of rare-earth (RE) impurities in the lattice voids of CoSb<sub>3</sub> are studied by ab initio density functional calculations. Our calculations reveal that the FFL decreases rapidly from La to Sm, and becomes zero from Gd to Lu, with the exception of Eu...
以CoCl2、SbCl3为原料, NaBH4为还原剂, 乙醇为溶剂, 与熔炼制备的n型CoSb3微米级别的粉末一起放入高压反应釜中, 在250℃下反应72h得到微纳复合的粉末材料, 热压后得到微纳复合的块体材料. 性能测试结果表明, 该材料表现为典型掺杂半导体的导电特征, 具有较好的电学性能. 微纳复合结构引入大量晶界增强了声子散射,...
百度试题 结果1 题目F=F_1(1)(-∞,1/4,-4)(2)1cmsecapaiot()(A-f)incine=enea(3)The(t)isblue.(4)ImgcosB+td(5)we'eesinB:()=(2,x) 相关知识点: 试题来源: 解析 (1)getup:o'clock(2)socks(3)sea(4)plane(5)visit 反馈 收藏 ...
【题目】已知cos (a+ b )cosb+sin( a + b)s in b =a属于(27°0,36°0),求cos(2a+4°5)的值。 相关知识点: 试题来源: 解析 【解析】 cos(a+b)cosb+sin(a+b )s inb =cos(a+b-b ) =c osa= a=300° cos(2a+4°5) =co s64°5 --号 ...
•Ab initiocalculations for Co1-xRhxSb3solid solutions were carried out.•Relationship between the structural parameters and band gap size was deeply analyzed.•External pressure influence on topological properties of bonds were investigated.•Possible way of CoSb3-RhSb3alloy structure modification...