a=sin(cos210°)和b=sin(sin210°),a,b哪个大
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a=sin(cos210°)和b=sin(sin210°),a,b哪个大
如题 a=sin(cos210°)和b=sin(sin210°),a,b哪个大请说明为什么
cos210°=?
【证明】Sin A+sin B=2Sin 22
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sin(a)=2sin(b)求sin(a/2)/sin(b/2)的值.
证明sin(a+b)sin(a-b)=sin²a-sin² b,并用该式计算sin²20°+sin80°sin40°
sin²20°+sin80°sin40°且sin(a+b)sin(a-b)=sin^2a-sin^2b
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
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)
求 sin(a+b)=?