sin(a)=5/13.a+b=45度,求sin(b).如题.
来源：学生作业帮助网 编辑：六六作业网 时间：2024/05/14 17:57:56
sin(a)=5/13.a+b=45度,求sin(b).如题.sin(a)=5/13.a+b=45度,求sin(b).如题.sin(a)=5/13.a+b=45度,求sin(b).如题.sin(a)=
sin(a)=5/13.a+b=45度,求sin(b).如题.
sin(a)=5/13.a+b=45度,求sin(b).
如题.
sin(a)=5/13.a+b=45度,求sin(b).如题.
sin(a)=5/13→cos(a)=12/13
sin(a+b)=sin45°=√2/2
=sin(a)cos(b)+cos(a)sin(b)
=5/13·cos(b)+12/13·sin(b)
cos(a+b)=cos45°=√2/2
=cos(a)cos(b)-sin(a)sin(b)
=12/13·cos(b)-5/13·sin(b)
两式相等简化后为：
17sin(b)=7cos(b) ……①
另：sin(b)^2+cos(b)^2=1 ……②
联合①、②解出：
sin（b）=7/√338
sin(a)=5/13.a+b=45度,求sin(b).如题.
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)
求证恒等式sin(A+B)sin(A-B)=sin²A-sin²B
求证:sin(a+b)sin(a-b)=sin^2a-sin^2b
已知3SIN^2A+2SIN^2B=5SINA,求SIN^2A+SIN^2B范围
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】Sin A+sin B=2Sin 22
证明sina sin(a+2b) - sinb sin(b+2a) =sin(a+b)sin(a-b)
已知sin(a)=2sin(b)求sin(a/2)/sin(b/2)的值.
sin(a+b)cosa-cos(a+b)sina=5/13 则sin（π-B)=?
sin(45度+a)=