已知角A、B为锐角,满足:3sin^2(A)+2sin^2(B)=1 3sin(2A)-2sin(2B)=0 求证:A+
已知a、b为锐角,a+b≠π/2,且满足3sinb=sin(2a+b)
a,b为锐角,3sina+3sinb=1 ,3sin(2a)-2sin(2b)=0 求sin(a+2b)
已知:锐角A,B满足cos(A+B)=1/2,sin(A-B)=1/3,求cos2A
在锐角△ABC中,已知sin(A+B)=3/5,且sin(A-B)=1/5,求证:tan A=2tan B
已知a,b均为锐角,且3sin^2a+2sin^2b=1,3sin2a-2sin2b=0,求a+2b?
已知A,B是锐角,A+B≠π/2,且满足3sinB=sin(2A+B)求证tanB≤2^(1/2)/4
证明sin(a+b)sin(a-b)=sin^2 a-sin^2 b,
已知3SIN^2A+2SIN^2B=5SINA,求SIN^2A+SIN^2B范围
已知A,B是锐角,A+B≠π/2,且满足3sinB=sin(2A+B),求证tanB≤(2^0.5)/4
已知a b为锐角,且3sin^2a=2sin^b=1,3sin2a-2sin2b=0,
【证明】Sin A+sin B=2Sin 22
求解 已知 sin(a+b)=1/2 ,sin(a_b)=1/3,求证:tan a=5tan b