如果△ABC三内角满足sin^2A+sin^2B=5sin^2C,求证sinC≤3/5
如果△ABC三内角满足sin^2A+sin^2B=5sin^2C,求证sinC≤3/5
在△ABC中,三个内角∠A、∠B、∠C满足sin^2A+sin^2C-sinA*sinC=sin^2B,则角B=
在△ABC中,如果三内角满足sin^2A+sin^2B=2sin^2C求角C的取值范围
已知△ABC的三内角A、B、C同时满足:①2cos²A/2-3cosA=0,②sin²B/2+sin
在△ABC中,三个内角∠A、∠B、∠C满足sin^2B+sina^2C-sin^2A=sinB*sinC,若c=3cm,
在三角形ABC中 求证:(a^2-b^2)/c^2=(sin(A-B)/sinC
sin^2A+sin^2B=sin^2C求证△ABC的形状
在△ABC中,求证:(a^2-b^2)/c^2=sin(A-B)/sinC
在三角形ABC中,求证:sin^A/2+sin^B/2+sin^C/2=1-2sinA/2sinB/2sinC/2
三角形ABC中,已知(sin^2 A-sin^2 B-sin^2 C)/(sinB sinC)=1 求A?
在三角形ABC中.已知sin^2A+sin^2B*sin^2C=sinB*sinC+sinC*sinA+sinA*sin
设△ABC的三个内角为A,B,C,三边长分别为a,b,c.求证:(a^2-b^2)/c^2=[sin(A-B)/sinC