sin(a+b)=1/4,sin(a-b)= 1/3,则tana/tanb等于?
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懂得进.证明,sina+sin(a+b)+sin(a+2b)+...sin(a+nb)=sin(a+ab/2)sin[(n+1)b/2]/sin(b/2)
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
sin a-sin b等于
证明 sin^2A+sin^2B-sin^2A*sin^2B+cos^2A*cos^2证明 sin^2A+sin^2B-sin^2A*sin^2B+cos^2A*cos^2B=1
【证明】Sin A+sin B=2Sin 22
sin(a+b)=1/4,sin(a-b)= 1/3,则tana/tanb等于?
已知sin(a)=2sin(b)求sin(a/2)/sin(b/2)的值.
在△ABC中,求证;sin^(A/2)+sin^(B/2)+sin^(C/2)=1-2sin(A/2)sin(B/2)sin(C/2)
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
sin²a+sin²b-sina²sin²b+cos²cosb=1
证明等式恒成立 sin^a+sin^b-sin^asin^b+cos^acos^b=1sin^a+sin^b-sin^asin^b+cos^acos^b=1 只需证sin^a(1-sin^b)+sin^b+cos^acos^b=1 只需证sin^acos^b+cos^acos^b+sin^b=1 这里到这里没有看懂
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