怎么两个一样..= =
a=2b,sinA=2sinB 还是sinA=2sinB
3个回答
相关问题
-
在三角形ABC中,(sinA-sinB)/sin(A+B)=(√2sinA-sinC)/(sinA+sinB)
-
求证sin(2A+B)/sinA-2cos(A+B)=sinB/sinA
-
证明sin(2a+b)/sina-2cos(a+b)=sinb/sina
-
证明sinA-sinB=2cosA+B/2sinA-B/2
-
sinb/sina=cos(a+b),证明3sinb=sin(2a+b)
-
化简：sina^2+sinb^2-sina^2sinb^2+cosa^2cosb^2
-
3sina^2-2sinb^2=2sina,求sinb^2-1/2sina的最小值
-
证明sin(a+b)sin(a-b)=(sina+sinb)(sina-sinb)
-
a,b为锐角(1+sina-cosa)/sina * (1+sinb-cosb) /sinb=2,求tana*tanb
-
a/sinA=b/sinB=c/sinC (a+b+c)/(sinA+sinB+sinC)=a/sinA'''''为什么