化简sin(A+B)sin(A-B)要过程
貌似不难,sin(a+b)cos(c-b)-cos(b+a)sin(b-c)sin(a-b)sin(b-c)-cos(a
sin(a-b)sin(b-r)-cos(a-b)cos(r-b)
sinc为什么等于sin(A+B)?
求sin(a+b)公式,
为什么sin(a+b)-sina=2sin(b/2)cos(a+b/2)
cos(a-b)cosb-sin(a-b)sinb
cos(a+b)+cos(a-b)/sin(a+b)+sin(a-b)化简
证明sin(a+b)sin(a-b)=sin^2 a-sin^2 b,
sin(a+B)cos(y-B)-cos(B+a)sin(B-y) 化简
已知sin(2a+b)=3sin(b) 求tan(a+b)/tan(a)的值
【证明】Sin A+sin B=2Sin 22
1:sin(a-b)=sin(-b+a)