sin(A+B)=4/5,sin(A-B)=-3/5,则tanA/tanB=
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sin(A+B)=4/5,sin(A-B)=-3/5,则tanA/tanB=
sin(A+B)=4/5,sin(A-B)=-3/5,则tanA/tanB=
sin(A+B)=4/5,sin(A-B)=-3/5,则tanA/tanB=
把已知的两式展开
sin a sin b+cos a cos b=4/5
sin a sin b-cos a cos b=-3/5
列方程就得到sin a sin b=1/10 cos a cos b= 7/10
第一个除以第二个就是 tan a /tan b 结果是1/7
证明sin(a+b)sin(a-b)=sin^2 a-sin^2 b,
如何证明sin(a+b)sin(a-b)=sin*a-sin*b (*为平方)
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求证:sin(a+b)sin(a-b)=sin^2a-sin^2b
sin a-sin b等于
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sin(A+B)=4/5,sin(A-B)=-3/5,则tanA/tanB=
已知3SIN^2A+2SIN^2B=5SINA,求SIN^2A+SIN^2B范围
已知sin(a)=2sin(b)求sin(a/2)/sin(b/2)的值.
3 在三角形ABC中,已知(a2+b2)sin(A-B)=(a2-b2)sin(A+B) 求证:ABC是等腰或直角三角形(a^2+b^2)sin(A-B)=(a^2-b^2)sin(A+B),(sin^A+sin^B)sin(A-B)=(sin^A-sin^B)sin(A+B) sin^A*(sin(A+B)-sin(A-B))=sin^B*(sin(A-B)+sin(A+B)) sin^A*2c
sin(a+b)sin(a-b)=sin2a-sin2b求证
求证:sin(A+B)sin(A-B)=sinAsinA-sinBsinB
sin(a-b)=sin(a+b)吗?
SIN(B-A)=-SIN(A-B)为啥
求 sin(a+b)=?
sin(a-b)=?
证明sina sin(a+2b) - sinb sin(b+2a) =sin(a+b)sin(a-b)
A,B为锐角,sin A=4/5,COS(A+B)=5/13,求sin B