sinA/1=(3/2)/(sinA+√3cosA)
2sinA^2+2√3sinAcosA=3
√3sin2A=2+cos2A
3sin2A^2=4+4cos2A+cos2A^2
cos2A=-1/2,2A=2/3π,A=π/3
AH=AB*sinB=c*sinB=4√3sinB^2
s=aAH/2=2*4√3sinB^2/2=4√3sinB^2>=√3
π/6
设锐角三角形ABC的三内角A,B,C的对边分别为a,b,c,已知向量m=(1,sinA+√3cosA),n=(sinA,3/2),且m∥n,若a=2,c=4√3sinB,且三角形ABC的面积小于√3,求角B的取值范围
设锐角三角形ABC的三内角A,B,C的对边分别为a,b,c,已知向量m=(1,sinA+√3cosA),n=(sinA,3/2),且m∥n,若a=2,c=4√3sinB,且三角形ABC的面积小于√3,求角B的取值范围
数学人气:616 ℃时间:2019-08-20 00:19:11
优质解答
我来回答
类似推荐
猜你喜欢
- 1用饱和碳酸钠溶液可将硫酸钡沉淀转变为碳酸钡沉淀,说明硫酸钡的溶度积大于碳酸钡.
- 2Have you ever had problems in your life and don't know how to be happy?
- 3Thousands of people were t________ after the earthquake happened in Wenchuan .
- 41.若x+根号3的绝对值+(y—1/3根号3)的平方=0,求(xy)^2009 2.已知x=根号27—3,求x^2+6x+2的值 求求你们了,
- 5甲乙两人以均匀的速度分别从A.B两地同时出发.相向而行,他们第一次相遇地点离A地4千米,相遇后两人
- 6如图,在四边形ABCD中,∠B=90°,AB=3,∠BAC=30°,CD=2,AD=22,求∠ACD的度数.
- 7请问“冰冻三尺非一日之寒?”的下面一句是什么?
- 8已知x²+y²+z²-2x+4y-6z+14=0,求代数式(x-y-z)的2013次方的值
- 9牛、马、羊、猪、狗、鸡的英语翻译是什么?
- 10Ann is always the last one _____in her class,because she needs to lock the door