sin(a+b)证明

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怎样证明/sin a +sin 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

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懂得进.证明,sina+sin(a+b)+sin(a+2b)+...sin(a+nb)=sin(a+

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a(sin B-sin C)+b(sin C+sin A)+c(sin A-sin B)=0 请证明

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