证明sina sin(a+2b) - sinb sin(b+2a) =sin(a+b)sin(a-b)
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证明sinasin(a+2b)-sinbsin(b+2a)=sin(a+b)sin(a-b)证明sinasin(a+2b)-sinbsin(b+2a)=sin(a+b)sin(a-b)证明sinasi
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)
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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
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