作业帮证明sina sin(a+2b) - sinb sin(b+2a) =sin(a+b)sin(a-b)
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证明sina sin(a+2b) - sinb sin(b+2a) =sin(a+b)sin(a-b)
证明sina sin(a+2b) - sinb sin(b+2a) =sin(a+b)sin(a-b)
证明sina sin(a+2b) - sinb sin(b+2a) =sin(a+b)sin(a-b)
证明：sinasin(a+2b)-sinbsin(b+2a)=sin(a+b)sin(a-b)
<==>sinasin(a+b+b)-sinbsin(a+b+a)=sin(a+b)sin(a-b)
<==>sinasin(a+b)cosb+sinacos(a+b)sinb-sinbsin(a+b)cosa-sinbcos(a+b)sina=sin(a+b)sin(a-b)
<==>sin(a+b)(sinacosb-cosasinb)=sin(a+b)sin(a-b)
<==>sin(a+b)sin(a-b)=sin(a+b)sin(a-b)恒成立
以上各步可逆,证毕
证明sina sin(a+2b) - sinb sin(b+2a) =sin(a+b)sin(a-b)
证明sin(2a+b)/sina-2cos(a+b)=sinb/sina
证明sin(2a+b)/sina-2cos(a+b)=sinb/sina
证明三角函数等式sin(A+B)-sinA=2cos(A+B/2)sin(B/2)
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)=(sina+sinb)(sina-sinb)
如何证明sinA+sinB=2sin((A+B)/2)cos((A-B)/2)
证明sin(a+b)-sina=2sinb/2*cos(a+b/2)
证明:sin(2a+b)/sinb-2cos(a+b)=sinb/sina急
sinA(cos(2A+B)+cosB)=cosA(sin(2A+B)-sinB)证明
tan(A+B)=2tanB 证明3sinA=sin(A+2B)
tan(A+B)=2tanB 证明3sinA=sin(A+2B)笑嘻嘻
sinb/sina=cos(a+b),证明3sinb=sin(2a+b)
证明sin^2a+sin^2β+1>sina*cosa+sina+sinβ
|sin(a+b)|小于等于|sina|+|sinb|的证明,
1.利用公式C(a-b)、S(a-b)证明：（1）cos(3排除以2-a)=-sina (2)sin(3排除以2-a)=-cosa (3)cos(排-a...1.利用公式C(a-b)、S(a-b)证明：（1）cos(3排除以2-a)=-sina (2)sin(3排除以2-a)=-cosa (3)cos(排-a)=-cosa (4)sin(排-a)=sina
证明三角函数(和角公式)cosa(cosa-cosb)+sina(sina-sinb)=2sin²(a-b/2)
如何证明sin(A-B)*sin(A+B)=sinA²-sinB²