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$$\bex \sin(x+y)=\sin x\cos y+\cos x\sin y. \eex$$ Ref. [Proof Without Words: Sine Sum Identity, The College Mathematics Journal].
[再寄小读者之数学篇](2014-11-19 $\sin(x+y)=\sin x\cos y+\cos x\sin y$)
标签：style blog http color os sp on 2014 log
原文地址：http://www.cnblogs.com/zhangzujin/p/4107704.html
